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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position ofprimary stress in each of the following questions.
A. solidarity
B. communicate
C. documentary
D. dedication Đáp án là: B. communicate </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phân bố dân cư nước ta không có đặc trưng nào sau đây?
A. Phân bố dân cư chưa hợp lí giữa các vùng.
B. Miền núi có mật độ dân cư cao hơn mức trung bình cả nước.
C. Trung du, miền núi nhiều tải nguyên nhưng dân cư ít.
D. Đồng bằng có tài nguyên hạn chế nhưng dân cư đông. Đáp án là: B. Miền núi có mật độ dân cư cao hơn mức trung bình cả nước. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage. Question 5
A.most
B.mostly
C.most of
D.mostly of Đáp án là: A.most </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhận định nào sau đây không đúng với thế mạnh của khu vực đồng bằng nước ta?
A. Phát triển giao thông vận tải đường bộ, đường sông.
B. Là cơ sở phát triển nền nông nghiệp nhiệt đới với cơ cấu sản phẩm đa dạng.
C. Thuận lợi tập trung các thành phố, các khu công nghiệp.
D. Các sông có trữ năng thủy điện lớn. Đáp án là: D. Các sông có trữ năng thủy điện lớn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong lịch sử phát triển nông nghiệp có các hình thức sử sụng đất nào?
A. Thâm canh và xen canh
B. Quảng canh và thâm canh
C. Xen canh và quảng canh
D. Các ý trên đúng Đáp án là: B. Quảng canh và thâm canh </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo quan niệm hiện đại, các yếu tố ngẫu nhiên tác động vào quần thể
A. làm thay đổi tần số alen không theo hướng xác định
B. không làm thay đỏi tần số các alen quần thể
C. luôn làm tăng tần số kiểu gen đồng hợp tử và giảm tần số kiểu gen dị hợp tử
D. luôn làm tăng tính đa dạng di truyền của quần thể Đáp án là: A. làm thay đổi tần số alen không theo hướng xác định </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thêm V lít dung dịch NaOH 1M vào 100 ml dung dịch chứa H Cl 0,1M và A1 Cl 3 0,1M. Lượng kết tủa thu được lớn nhất với thể tích dung dịch NaOH là:
A. 0,08
B. 0,02
C. 0,04
D. 0,06 Đáp án là: C. 0,04 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho dãy các chất: CH 3 COOH 3 NCH 3, H 2 NCH 2 COONa, H 2 NCH 2 CONHCH 2 -COOH, ClH 3 NCH 2 COOH, saccarozơ và glyxin. Số chất trong dãy vừa tác dụng với NaOH, vừa tác dụng với dung dịch HCl là.
A. 2.
B. 3.
C. 4.
D. 5. Đáp án là: B. 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose A, B, C or D which has different sound form the others.
A. add ed
B. wash ed
C. stopp ed
D. work ed Đáp án là: A. add ed </s> | [
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<s> Chọn đáp án đúng với câu hỏi: I told you _______ the computer, didn’t it?
A. to switch off
B. don’t switch off
C. not switch off
D. switch off Đáp án là: A. to switch off </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ai là linh hồn của quốc tế thứ nhất?
A. Các -MÁc
B. Ăng-ghen
C. Lê-nin
D. Xta-lin Đáp án là: A. Các -MÁc </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hồ nước ngọt sâu nhất thế giới là hồ nào?
A. Hồ Superior
B. Hồ Victoria
C. Hồ Baikal
D. Biển Caspi Đáp án là: C. Hồ Baikal </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho biết mỗi gen quy định một tính trạng, alen trội là trội hoàn toàn. Phép lai P; AabbDd × AaBbDd tạo ra F 1 có số cá thể mang kiểu hình khác P chiếm tỉ lệ:
A. 7/16
B. 9/32
C. 18/32
D. 23/32 Đáp án là: A. 7/16 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giải thích nào dưới đây về ứng dụng của crom không hợp lí?
A. Crom là kim loại cứng nhất có thể dùng để cắt thủy tinh
B. Crom là kim loại nhẹ, nên được sử dụng tạo các hợp kim dùng trong ngành hàng không
C. Crom là hợp kim cứng chịu nhiệt hơn nên dùng để tạo thép cứng, không gỉ, chịu nhiệt
D. Điều kiện thường, crom tạo được lớp màng oxit mịn, bền chắc nên crom được dùng để mạ bảo vệ thép Đáp án là: B. Crom là kim loại nhẹ, nên được sử dụng tạo các hợp kim dùng trong ngành hàng không </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Bà có 24 quả cam. Bà cho An 1/3 số quả cam. Hỏi An có bao nhiêu quả cam?
A. 7 quả cam
B. 6 quả cam
C. 24 quả cam
D. 8 quả cam Đáp án là: D. 8 quả cam </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tại hai điểm A và B cách nhau 5cm trong chân không có hai điện tích điểm q 1 = + 16.10 - 8 C và q 2 = - 9.10 - 8 C. Tính độ lớn cường độ điện trường tổng hợp tại điểm C cách A và cách B lần lượt là 4cm và 3cm
A. 1273kV/m
B. 1444kV/m
C. 1288kV/m
D. 1285kV/m Đáp án là: A. 1273kV/m </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dòng điện có tác dụng phát sáng khi chạy qua dụng cụ nào dưới đây, khi chúng hoạt động bình thường
A. Công tắc
B. Đèn báo của tivi
C. Máy bơm nước chạy điện
D. Dây dẫn điện ở gia đình Đáp án là: B. Đèn báo của tivi </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong không gian với hệ tọa độ oxyz, cho mặt cầu (S) :x^2+(y+2)^2+(z-2)^2=8. Tính bán kính R của (S)
A. R=8
B. R=2
C. R=4
D. R=64 Đáp án là: B. R=2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho ∫01f(x)dx = 2. Khi đó ∫01(2f(x)+e^x)dx bằng
A. 5 – e
B. 5 + e
C. e + 3
D. 3 – e Đáp án là: C. e + 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong cùng một vĩ độ, sự sắp xếp các khu sinh học theo sự tăng dần của lượng mưa là
A. Rừng mưa nhiệt đới => Savan => Hoang mạc, sa mạc
B. Rừng rụng lá ôn đới => Thảo nguyên => Rừng Địa Trung Hải
C. Savan => Hoang mạc, sa mạc => Rừng mưa nhiệt đới
D. Rừng địa trung hải => Thảo nguyên => Rừng rụng lá ôn đới Đáp án là: D. Rừng địa trung hải => Thảo nguyên => Rừng rụng lá ôn đới </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Staying in a hotel costs ______ renting a room in a dormitory for a week.
A. twice as much as
B. as much as twice
C. twice more than
D. twice as Đáp án là: A. twice as much as </s> | [
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<s> Chọn đáp án đúng với câu hỏi: It can be inferred from the passage that the principle of use and disuse enables organisms to________.
A. change their existence
B. automatically benefit
C. survive in any condition
D. improve their lifetime Đáp án là: C. survive in any condition </s> | [
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<s> Chọn đáp án đúng với câu hỏi: _______ little knowledge is _______ dangerous thing.
A. A/ the
B. A/ a
C. The/ the
D. The/ a Đáp án là: B. A/ a </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhiệt độ của không khí trong phòng là 20 o C. Nếu cho máy điều hòa nhiệt độ chạy để làm lạnh không khí trong phòng xuống tới 12 o C thì hơi nước trong không khí trong phòng trở nên bảo hòa và ngưng tụ thành sương. Nhiệt độ 12 o C được gọi là ‘‘điểm sương’’ của không khí trong phòng. Tính độ ẩm tuyệt đối và độ ẩm tỉ đối của không khí trong căn phòng này. Biết độ ẩm cực đại của không khí ở 20 o C và 12 o C lần lượt là 17,30 g/m 3 và 10,76 g/m 3.
A. f = 88 %
B. f = 70 %
C. f = 68 %
D. f = 62 % Đáp án là: D. f = 62 % </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hình chóp đều, chọn mệnh đề sai trong các mệnh đề sau:
A. Chân đường cao hạ từ đỉnh của hình chóp đều trùng với tâm của đa giác đáy.
B. Đáy của hình chóp đều là đa giác đều.
C. Các mặt bên của hình chóp đều là những tam giác cân.
D. Tất cả các cạnh của hình chóp đều bằng nhau. Đáp án là: D. Tất cả các cạnh của hình chóp đều bằng nhau </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Biến đổi nào là quan trọng nhất của các nước Đông Nam Á từ sau chiến tranh thế giới thứ hai đến nay?
A. Đều tham gia vào tổ chức Liên hợp quốc.
B. Hầu hết các nước đều lần lượt gia nhập tổ chức ASEAN.
C. Đều trở thành các nước công nghiệp mới.
D. Hầu hết các nước đều giành được độc lập ở các mức độ khác nhau Đáp án là: D. Hầu hết các nước đều giành được độc lập ở các mức độ khác nhau </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Câu hỏi trắc nghiệm Điền từ thích hợp vào chỗ trống để hoàn thiện nghĩa của câu sau: thụ tinh là hiện tượng tế bào sinh dục...(1)...của hạt phấn kết hợp với tế bào sinh dục.(2)...có trong noãn tạo thành một tế bào...(3)...
A. (1): đực; (2): cái; (3): hợp tử
B. (1): cái; (2): đực; (3): noãn
C. (1): cái; (2): đực; (3): hợp tử
D. (1): đực; (2): cái; (3): noãn Đáp án là: A. (1): đực; (2): cái; (3): hợp tử </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 16, cho biết nhận xét nào sau đây không đúng về sự phân bố các dân tộc ở Việt Nam?
A. Các dân tộc phân bố xen kẽ nhau.
B. Dân tộc Kinh phân bố tập trung ở đồng bằng, trung du.
C. Các dân tộc ít người phân bố nhiều ở miền núi.
D. Ở các đảo ven bờ không có sự phân bố của dân tộc nào. Đáp án là: D. Ở các đảo ven bờ không có sự phân bố của dân tộc nào </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thấu kính ta xét trong chương trình:
A. là thấu kính mỏng, có hai mặt giới hạn là hai mặt cong hoặc một mặt cong và một mặt phẳng.
B. là thấu kính mỏng, có hai mặt giới hạn là hai mặt cầu hoặc một mặt phẳng và một mặt cầu.
C. là thấu kính có độ dày tùy ý, có hai mặt giới hạn là hai mặt cong hoặc một mặt cong và một mặt phẳng.
D. là thấu kính có độ dày tùy ý, có hai mặt giới hạn là hai mặt cầu hoặc một mặt cầu và một mặt phẳng. Đáp án là: A. là thấu kính mỏng, có hai mặt giới hạn là hai mặt cong hoặc một mặt cong và một mặt phẳng. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dung dịch đường dùng để tiêm hoặc truyền vào tĩnh mạch cho bệnh nhân là
A. glucozơ
B. fructozơ
C. amilozo
D. saccarozơ Đáp án là: A. glucozơ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhận xét nào sau đây không đúng?
A. Dao động tắt dần càng nhanh nếu lực cản của môi trường càng lớn.
B. Biên độ của dao động cưỡng bức không phụ thuộc vào tần số của lực cưỡng bức
C. Trong dao động duy trì, biên độ dao động luôn không đổi.
D. Dao động cưỡng bức có tần số bằng tần số của lực cưỡng bức Đáp án là: B. Biên độ của dao động cưỡng bức không phụ thuộc vào tần số của lực cưỡng bức </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo sơ đồ phản ứng sau C H 4 → A t 0 → B C t o → 1 : 1 H N O 3, H 2 S O 4 c → F e, H C l d u D Chất A, B, C,D lần lượt là : →
A. C 2 H 2, C 6 H 6, C 6 H 5 NO 2, C 6 H 5 NH 2
B. C 2 H 2, C 6 H 6, C 6 H 5 NO 2, C 6 H 5 NH 3 Cl
C. C 2 H 4, C 6 H 6, C 6 H 5 NH 2, C 6 H 5 NH 3 Cl
D. C 6 H 6, C 6 H 5 NO 2, C 6 H 5 NH 2,C 6 H 5 NH 3 Cl Đáp án là: B. C 2 H 2, C 6 H 6, C 6 H 5 NO 2, C 6 H 5 NH 3 Cl </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một trật tự thế giới mới đựơc hình thành sau chiến tranh thế giới thứ nhất là
A. Hệ thống Pari - Vec-xai
B. Hệ thống Vec-xai - Oasinhtơn
C. Hệ thống Bec-lin - Tôkiô
D. Hệ thống Vec-xai - Rôma Đáp án là: B. Hệ thống Vec-xai - Oasinhtơn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một chuỗi thức ăn, năng lượng tích lũy Sinh vật sản xuất : 3.10 8 Kcal Sinh vật tiêu thụ bậc 1: 24.10 6 Kcal. Sinh vật tiêu thụ bậc 2: 1,5.10 4 Kcal. Sinh vật tiêu thụ bậc 3: 1000 Kcal. Sinh vật tiêu thụ bậc 4: 125 Kcal. Hiệu suất sinh thái giữa bậc dinh dưỡng cấp 2 với bậc dinh dưỡng cấp 1 và giữa sinh vật tiêu thụ bậc 3 với sinh vật tiêu thụ bậc 2 trong chuỗi thức ăn trên lần lượt là:
A. 8% và 9%.
B. 8% và 6,67%.
C. 9% và 6,67%
D. 6,67% và 8% Đáp án là: B. 8% và 6,67%. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vật dao động điều hòa với chu kì 2 s. Chọn gốc tọa độ ở vị trí cân bằng, gốc thời gian là lúc vật có li độ − 2 2 và đang chuyển động ra xa vị trí cân bằng với tốc độ 2 π 2 cm/s. Phương trình dao động của vật là:
A. x = 2 2 cos π t − π 4 c m.
B. x = 4 cos π t − 3 π 4 c m.
C. x = 4 cos π t + 3 π 4 c m.
D. x = 4 cos π t + π 4 c m. Đáp án là: C. x = 4 cos π t + 3 π 4 c m. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây cho thấy tầm quan trọng của các quốc gia Tây Nam Á đối với nền kinh tế thế giới?
A. Vị trí địa chính trị quan trọng.
B. Nơi xuất khẩu dầu mỏ lớn nhất thế giới.
C. Tài nguyên thiên nhiên đa dạng, phong phú.
D. Nền kinh tế phát triển nhanh. Đáp án là: B. Nơi xuất khẩu dầu mỏ lớn nhất thế giới. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. It's
B. It
C. there's
D. They're Đáp án là: A. It's </s> | [
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<s> Chọn đáp án đúng với câu hỏi: People gathered in the main square on the Independence Day to memorize those who had made the supreme sacrifice for the liberation of the nation.
A. gathered
B. Independence
C. memorize
D. supreme Đáp án là: C. memorize </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Find the word which has a different sound in the part underlined.
A. pack ed
B. punch ed
C. pleas ed
D. push ed Đáp án là: A. pack ed </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Biết (x)/(y)=9/11 và x + y = 60. Giá trị x và y là:
A. x = 27; y = 33;
B. x = 33; y = 27;
C. x = 27; y = 44;
D. x = 27; y = 34. Đáp án là: A. x = 27; y = 33; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Viết phân số 11/24 dưới dạng số thập phân vô hạn tuần hoàn là
A. 0,45(8)3;
B. 0,4(583);
C. 0,458(3);
D. 0,458. Đáp án là: C. 0,458(3); </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the letter A, B, C or D to answer these following questions Nha Trang Carnival – Exciting Times in June! Join the opening ceremony – an impressive show giving the history of Nha Trang, a city with a good climate provided by nature. Then comes the firework display, which lights up the whole city, followed by the street carnival the next morning. You will also like various traditional, musical performances by the Viet, the Cham, and other ethnic peoples, in addition to performances of songs about the sea. The following day brings the excitement of sea swimming, yachting, boating, and wind-surfing events. When the night falls, the public dances begin – you are welcome to join in! Don’t miss this colorful mix of cultures! Question: When is street carnival held?
A. the next morning
B. the next afternoon
C. the next year
D. the next year Đáp án là: A. the next morning </s> | [
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<s> Chọn đáp án đúng với câu hỏi: It’s not necessary for you to do this project.
A. You would do this project.
B. You can’t do this project.
C. You must do this project.
D. You needn’t do this project. Đáp án là: D. You needn’t do this project </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi trời mưa dông, ta thường nghe thấy tiếng sấm. Vậy vật nào đã dao động phát ra tiếng sấm?
A. Các đám mây va chạm vào nhau nên đã dao động phát ra tiếng sấm
B. Không khí xung quanh tia lửa điện đã bị dãn nở đột ngột khiến chúng dao động gây ra tiếng sấm
C. Các tia lửa điện khổng lồ dao động gây ra tiếng sấm
D. Cả ba lí do trên Đáp án là: B. Không khí xung quanh tia lửa điện đã bị dãn nở đột ngột khiến chúng dao động gây ra tiếng sấm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hiệp ước đánh dấu việc triều đình nhà Nguyễn chính thức thừa nhận sáu tỉnh Nam Kì là đất thuộc Pháp là
A. Hiệp ước Nhâm Tuất
B. Hiệp ước Giáp Tuất
C. Hiệp ước Hácmăng
D. Hiệp ước Patơnốt Đáp án là: B. Hiệp ước Giáp Tuất </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một người chọn ngẫu nhiên hai chiếc giày từ bốn đôi giày cỡ khác nhau. Xác suất để hai chiếc chọn được tạo thành một đôi là:
A. 4/7.
B. 3/14.
C. 1/7.
D. 5/28. Đáp án là: C. 1/7. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thanh AB trượt thẳng đều trên mặt phẳng ngang theo chiều như hình vẽ, vận tốc của thanh AB có độ lớn 2 m / s, vận tốc của AB vuông góc với các đường cảm ứng từ. Cho AB = 40 cm, B = 0,2 T, ξ = 2 V, r = 0 Ω, R A B = 0,8 Ω, bỏ qua điện trở của dây nối và ampe kế. Số chỉ của ampe kế bằng?
A. 1,8 A.
B. 2,5 A.
C. 2,7 A.
D. 3,0 A. Đáp án là: C. 2,7 A. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào không đúng?
A. Tất cả các kim loại kiềm thổ đều tác dụng với dung dịch HCl.
B. Tất cả các kim loại kiềm thổ đều tác dụng với nước.
C. Tất cả các kim loại kiềm thổ đều tác dụng với oxi ở nhiệt độ cao.
D. Tất cả các kim loại kiềm thổ đều tác dụng với dung dịch HNO 3 đặc, nguội. Đáp án là: B. Tất cả các kim loại kiềm thổ đều tác dụng với nước. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: X và Y là hai chất hữu cơ có cùng công thức phân tử C 6 H 13 N O 4. Khi X tác dụng vừa đủ với dung dịch NaOH đun nóng thu được amin Z, ancol đơn chức T và dung dịch muối của axit cacboxylic E (Z, T, E đều có cùng số nguyên tử cacbon). Lấy m gam hỗn hợp X, Y tác dụng vừa đủ với 600 ml dung dịch NaOH 1M đun nóng, sau khi các phản ứng xảy ra hoàn toàn thu được 13,5 gam Z; 9,2 gam T và dung dịch Q gồm 3 chất hữu cơ có cùng số nguyên tử cacbon. Cô cạn dung dịch Q thu được a gam chất rắn khan M. Phần trăm khối lượng của chất có phân tử khối bé nhất M là
A. 16,33
B. 59,82%
C. 9,15%
D. 18,3% Đáp án là: C. 9,15% </s> | [
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<s> Chọn đáp án đúng với câu hỏi: “Remember to phone me when you arrive at the airport, _______?”
A. won’t you
B. will you
C. do you
D. don’t you Đáp án là: B. will you </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dòng điện cảm ứng trong mạch kín có chiều
A. sao cho từ trường cảm ứng có chiều chống lại sự biến thiên từ thông ban đầu qua mạch.
B. hoàn toàn ngẫu nhiên.
C. sao cho từ trường cảm ứng luôn cùng chiều với từ trường ngoài.
D. sao cho từ trường cảm ứng luôn ngược chiều với từ trường ngoài. Đáp án là: D. sao cho từ trường cảm ứng luôn ngược chiều với từ trường ngoài </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngành vận tải đường biển có tỉ trọng khối lượng hàng hóa vận chuyển thấp nhưng tỉ trọng khối lượng hàng hóa luân chuyển lớn nhất do
A. tốc độ vận chuyển của đường biển chậm.
B. đường biển đảm nhận vận tải hàng nặng, đi xa.
C. hàng vận tải bằng đường biển là hàng nặng, cồng kềnh.
D. đường biển chỉ dành cho việc vận tải hàng hóa. Đáp án là: B. đường biển đảm nhận vận tải hàng nặng, đi xa. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Những tình huống nào dưới đây cần viết biên bản?
A. Đơn xin nghỉ ốm
B. Đơn tường trình khi một nhóm học sinh tự ý đi tham quan khi chưa được phép của thầy cô và cha mẹ
C. Lớp em đề xuất đi tham quan bảo tàng dân tộc học
D. Ghi lại diễn biến và kết quả Đại hội Đoàn trường Đáp án là: D. Ghi lại diễn biến và kết quả Đại hội Đoàn trường </s> | [
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<s> Chọn đáp án đúng với câu hỏi: X là một α–minoaxit no, chứa 1 nhóm –COOH và 1 nhóm – N H 2. Từ 3m gam X điều chế được m 1 gam đipeptit. từ m gam X điều chế được m 2 gam tripeptit. Đốt cháy m 1 gam đipeptit thu được 1,35 mol H 2 O. Đốt cháy m 2 gam tripeptit thu được 0,425 mol H 2 O. Giá trị của m là
A. 11,25.
B. 22,50.
C. 13,35.
D. 26,70. Đáp án là: C. 13,35. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các số sau: 9 213 ; 8 999 ; 6 999; 9 214 số nào lớn nhất
A. 9 213.
B. 8 999.
C. 6 999.
D. 9 214 Đáp án là: D. 9 214 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Bài học kinh nghiệm nào của Tổng khởi nghĩa tháng Tám năm 1945 được Đảng ta tiếp tục vận dụng trong công cuộc công nghiệp, hóa hiện đại hóa đất nước nhằm phát huy sức mạnh của dân tộc?
A. Phải linh hoạt kết hợp các hình thức đấu tranh.
B. Kết hợp giữa đấu tranh với xây dựng để ngày càng vững mạnh
C. Tập hợp, tổ chức các lực lượng yêu nước.
D. Có đường lối đúng đắn, phù hợp. Đáp án là: C. Tập hợp, tổ chức các lực lượng yêu nước. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hiện tượng đẻ trứng thai là?
A. Trứng được thụ tinh trong cơ thể mẹ rồi mới đẻ ra ngoài
B. Trứng đẻ ra ngoài rồi mới được thụ tinh.
C. Trứng không thụ tinh vẫn có thể nở thành con non.
D. Trứng được thụ tinh trong cơ thể mẹ và phát triển nhờ noãn hoàng thành con non rồi mới đẻ ra ngoài. Đáp án là: D. Trứng được thụ tinh trong cơ thể mẹ và phát triển nhờ noãn hoàng thành con non rồi mới đẻ ra ngoài </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A. rhetoric
B. dynamic
C. climatic
D. phonetic Đáp án là: A. rhetoric </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất có công thức phân tử nào dưới đây có thể tác dụng được cả Na, cả NaOH?
A. C 5 H 8 O
B. C 6 H 8 O
C. C 7 H 10 O
D. C 9 H 12 O Đáp án là: D. C 9 H 12 O </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhận xét nào sau đây chưa chính xác? sống con người
A. Cả chó sói và cừu đều được La phông ten miêu tả như một số phận cụ thể
B. Hình ảnh chó sói và cừu trong thơ La Phông ten còn mang trong đó bóng dáng cuộc
C. La Phông ten không chỉ dựa vào đặc tính chủng loại mà còn dùng trí tưởng tượng phóng khoáng và lòng thương cảm để miêu tả chó sói và cừu
D. Hình tượng chó sói của La Phông ten chỉ là một kẻ đáng cười chứ không phải là một kẻ đáng ghét như trong những trang viết của Buy- phông Đáp án là: D. Hình tượng chó sói của La Phông ten chỉ là một kẻ đáng cười chứ không phải là một kẻ đáng ghét như trong những trang viết của Buy- phông </s> | [
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<s> Chọn đáp án đúng với câu hỏi: It wasn’t clear to us at the time how serious the problem was.
A. We were not sure about how serious the problem was at the time.
B. That the problem was serious was not made clear to us.
C. Little did we know anything about the seriousness of the problem.
D. Little did we realise at the time how serious the problem was. Đáp án là: D. Little did we realise at the time how serious the problem was </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tố Hữu nhận giải thưởng Hồ Chí Minh về văn học nghệ thuật năm bao nhiêu?
A. 1995
B.1996
C.1997
D. 1998 Đáp án là: B.1996 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tác dụng của áp lực phụ thuộc vào:
A. phương của lực
B. chiều của lực
C. điểm đặt của lực
D. độ lớn của áp lực và diện tích mặt bị ép Đáp án là: D. độ lớn của áp lực và diện tích mặt bị ép </s> | [
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29871,
30128,
30030,
865,
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274,
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29884,
298,
228,
190,
146,
29875,
29901,
10523,
30103,
29883,
868,
31214,
865,
2723,
207,
140,
29874,
263,
3... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho dãy các chất: Cr(OH) 3, Al 2 (SO 4 ) 3, Mg(OH) 2, Zn(OH) 2, MgO, CrO 3. Số chất trong dãy có tính chất lưỡng tính là
A. 2.
B. 4.
C. 5.
D. 3. Đáp án là: A. 2. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kết quả của 52 379 + 38 421 là:
A. 80 800.
B. 90 800.
C. 90 890.
D. 80 709. Đáp án là: B. 90 800. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. While Western medicine is common throughout the world, it is not the only type of medicine that people practice. Another kind of medical treatment is known as acupuncture. In general, it is considered to be an alternative type of medicine, it was developed in China over one thousand years ago, but exactly when and how it was created remain mysteries. Acupuncture involves the inserting of multiple needles into the body. The needles are placed at certain points in the body depending on the type of problem the patient has. According to the theory behind acupuncture, there are places on the skin that are connected to different parts of the body. By pricking the skin with needles at these points, an acupuncturist can help a patient either relieve pain or cure various problems. Acupuncture is popular in many parts of Asia. It is also becoming more common and attracting new patients in Europe and North America. But many people believe it is ineffective. The main reason they feel that way is that it is difficult to understand how the entire process works. Research into acupuncture’s capabilities has yielded varying results. Some studies show that it is quite effective at relieving pain. Other ones, however, claim that it is merely like a placebo. In other words, people believe acupuncture treatment will be effective, so it winds up helping them. What is the best title for the passage?
A. A New Type of Medicine
B. All about Acupuncture
C. Western Medicine vs. Acupuncture
D. Acupuncture: Does It Work? Đáp án là: B. All about Acupuncture </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đốt cháy hoàn toàn bột crom trong oxi (dư) thu được 4,56 gam một oxit (duy nhất). Khối lượng crom bị đốt cháy là:
A. 0,78 gam
B. 3,12 gam
C. 1,74 gam
D. 1,19 gam Đáp án là: B. 3,12 gam </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chia hỗn hợp gồm hai amino axit (no, mạch hở, phân tử mỗi chất chứa hai nhóm chức) thành 2 phần bằng nhau. Đốt cháy hoàn toàn phần một, thu được khí N 2, 11,88 gam CO 2 và 5,94 gam H 2 O. Cho phần hai tác dụng với dung dịch NaOH (vừa đủ), thu được a gam muối. Giá trị của a là
A. 14,70
B. 12,18
C. 13,92
D. 12,06 Đáp án là: D. 12,06 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho một hình đa diện. Trong các khẳng định sau, khẳng định nào sai?
A. Mỗi đỉnh là đỉnh chung của ít nhất ba cạnh.
B. Mỗi mặt có ít nhất ba cạnh.
C. Mỗi cạnh là cạnh chung của ít nhất ba mặt.
D. Mỗi đỉnh là đỉnh chung của ít nhất ba mặt. Đáp án là: C. Mỗi cạnh là cạnh chung của ít nhất ba mặt. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mục tiêu của cuộc chiến đấu chống Pháp ở Hà Nội trong những ngày đầu toàn quốc kháng chiến cuối năm 1946 đầu năm 1947 là gì?
A. Giam chân địch ở thành phố để hậu phương kịp huy động lực lượng kháng chiến chuẩn bị kháng chiến lâu dài.
B. Tiêu diệt toàn bộ lực lượng quân Pháp ở Hà Nội, bảo vệ cơ quan đầu não của Trung ương.
C. Phá hủy nhiều kho tàng, sinh lực của địch, cản bước tiến của chúng.
D. Bảo vệ được thủ đô Hà Nội và thành quả của Cách mạng tháng Tám năm 1945. Đáp án là: A. Giam chân địch ở thành phố để hậu phương kịp huy động lực lượng kháng chiến chuẩn bị kháng chiến lâu dài. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word whose stress pattern is different from that of the other words in the same group. Write your answer in the numbered box.
A. fulltime
B. farmhand
C. bookshop
D. tradesman Đáp án là: A. fulltime </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The main Hopi food is....................
A. corn
B. hamburgers
C. beef
D. vegetables Đáp án là: A. corn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở tế bào thực vật, ATP được tạo ra trong sự phản ứng với ánh sáng. Chuỗi truyền điện tử liên quan với quá trình này được định vị ở
A. Màng tilacoit của lục lạp
B. Stroma của lục lạp
C. Màng trong của ti thể
D. Cytosol Đáp án là: A. Màng tilacoit của lục lạp </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 9, cho biết Nha Trang thuộc vùng khí hậu nào sau đây?
A. Tây Nguyên.
B. Nam Bộ.
C. Nam Trung Bộ.
D. Bắc Trung Bộ. Đáp án là: C. Nam Trung Bộ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: What is the main idea of the second paragraph?
A. Taíno dishes are important in Puerto Rican cooking.
B. Puerto Rican cooking has had many influences.
C. Food that has been imported by foreigners isn’t really Puerto Rican.
D. American foods have probably had the most influence. Đáp án là: B. Puerto Rican cooking has had many influences. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Chính sách khai thác thuộc địa của thực dân Pháp đã tác động đến giai cấp nông dân Việt Nam như thế nào?
A. Nông dân bị phá sản, họ bị bần cùng hóa, không lối thoát.
B. Nông dân bị tước đoạt ruộng đất, cơ cực trăm bề.
C. Nông dân đều lâm vào hoàn cảnh nghèo khổ, không lối thoát.
D. Nông dân bị bần cùng hóa, không lối thoát. Đáp án là: A. Nông dân bị phá sản, họ bị bần cùng hóa, không lối thoát. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nguyên nhân dẫn tới phân li ổ sinh thái của các loài trong quần xã là
A. mỗi loài ăn một loại thức ăn khác nhau
B. mỗi loài kiếm ăn ở vị trí khác nhau
C. mỗi loài kiếm ăn vào 1 thời gian khác nhau trong ngày
D. cạnh tranh khác loài Đáp án là: D. cạnh tranh khác loài </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The wind is_______ to blow the roof off.
A. strong enough
B. too strong
C. quiet strong
D. very strong Đáp án là: A. strong enough </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để phân biệt tinh bột và xenlulozơ có thể dùng
A. dung dịch I 2
B. dung dịch H 2 SO 4, t 0
C. Cu(OH) 2
D. dung dịch NaOH Đáp án là: A. dung dịch I 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một dây dẫn mang dòng điện đặt trong từ trường đều, chịu tác dụng của lực từ. Nếu dòng điện trong dây dẫn đổi chiều còn vectơ cảm ứng từ vẫn không thay đổi thì vectơ lực từ sẽ
A. Đổi theo chiều ngược lại
B. Chỉ thay đổi về độ lớn
C. Không thay đổi
D. Quay một góc 90 0 Đáp án là: A. Đổi theo chiều ngược lại </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nguyên nhân chính gây ngập lụt ở vùng Đồng bằng sông Cửu Long là
A. địa hình thấp và ảnh hưởng của đê sông, đê biển.
B. do có nhiều kênh rạch chằng chịt.
C. mưa lớn kết hợp với triều cường.
D. diện tích trồng lúa chiếm tỉ trọng cao trong tổng diện tích gieo trồng. Đáp án là: C. mưa lớn kết hợp với triều cường. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một động cơ điện xoay chiều hoạt động bình thường với điện áp hiệu dụng 220V, cường độ dòng điện hiệu dụng 0,5 A và hệ số công suất của động cơ là 0,8. Biết rằng công suất hao phí của động cơ là 11 W. Hiệu suất của động cơ (tỉ số giữa công suất hữu ích và công suất tiêu thụ toàn phần) là
A. 80 %
B. 90 %
C. 92,5 %
D. 87,5 % Đáp án là: D. 87,5 % </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một người cao tuổi đeo kính lão có độ tụ D = + 2dp.
A. Đây là thấu kính hội tụ có tiêu cự 2 m.
B. Đây là thấu kính phân kỳ có tiêu cự (- 2 m).
C. Đây là thấu kính hội tụ có tiêu cự 0,5 m.
D. Đây là thấu kính phân kỳ có tiêu cự (- 0,5 m). Đáp án là: C. Đây là thấu kính hội tụ có tiêu cự 0,5 m. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các phát biểu sau: (a) Nhôm bền trong môi trường không khí và nước. (b) Nguyên liệu chính dùng để sản xuất nhôm là quặng boxit. (c ) Trong tự nhiên, kim loại nhôm chỉ tồn tại ở dạng đơn chất. (d) Thép có hàm lượng Fe cao hơn gang. (e) Sắt là nguyên tố phổ biến nhất trong vỏ trái đất. (f) Nhôm bị thụ động hóa bởi dung dịch HNO 3 đặc, nguội. Số phát biểu đúng là
A. 2.
B. 3
C. 4.
D. 5. Đáp án là: C. 4. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sứa di chuyển bằng cách
A. Di chuyển lộn đầu
B. Di chuyển sâu đo
C. Co bóp dù
D. Không di chuyển Đáp án là: C. Co bóp dù </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đai áp cao cận nhiệt đới phân bố ở đâu trên Trái Đất?
A. Tại hai chí tuyến
B. Trong khu vực nội chí tuyến
C. Khoảng 30 o vĩ tuyến Bắc và Nam
D. Trong môi trường nhiệt đới Đáp án là: C. Khoảng 30 o vĩ tuyến Bắc và Nam </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trộn 8,1 gam A l và 48 gam Fe 2 O 3 rồi cho tiến hành phản ứng nhiệt nhôm trong điều kiện không có không khí, kết thúc thí nghiệm thu được m gam hỗn hợp rắn. Giá trị của m là:
A. 61,5 gam
B. 56,1 gam
C. 65,1 gam
D. 51,6 gam Đáp án là: B. 56,1 gam </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho khai triển (1+x+x^2)^1009=a_0+a_1x+a_2x^2+...+a_2018x^2018. Khi đó a_0+a_1+a_2+...+a_2018 bằng
A. 3^1009
B. 3^1008
C. 3^2018
D. 3^2016 Đáp án là: A. 3^1009 </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Nhận định nào nói đúng nhất các nguyên nhân mà bao bì ni lông có thể gây nguy hại đến sức khỏe con người?
A. Bao bì ni lông màu đựng thực phẩm làm ô nhiễm thực phẩm do chứa các kim loại như chì, ca-đi-mi gây tác hại cho não và là nguyên nhân gây ung thư phổi
B. Bao bì ni lông thải bỏ bị đốt, các khí độc thải ra, đặc biệt là chất đi-ô-xin có thể gây ngộ độc, gây ngất, khó thở, nôn ra máu, ảnh hưởng đến các tuyến nội tiết, giảm khả năng miễn dịch, gây rối loạn chức năng, gây ưng thư,...
C. Sự tắc nghẽn hệ thống cống rãnh (do có những bao bì ni lông bị vứt xuống) làm cho muỗi phát sinh, lây truyền bệnh dịch
D. Cả ba nội dung trên đều đúng Đáp án là: D. Cả ba nội dung trên đều đúng </s> | [
1,
1,
29871,
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30975,
29876,
29871,
30128,
29976,
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1715,
29871,
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865,
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274,
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298,
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29901,
405,
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31214,
31500,
29876,
29871,
30128,
29875,
31214,
29876,
29... | [
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Climate change is one of the main causes endangering animals all over the world from hot deserts to humid swamp and deep in the ocean.
A. safeguarding
B. menacing
C. dishonoring
D. prejudicing Đáp án là: B. menacing </s> | [
1,
1,
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29901,
2233,
6490,
1735,
338,
697,
310,
278,
1667,
9946,
1095,
574,
3241,
... | [
1,
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1,
1,
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1,
1,
1,
1,
1,
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1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Xà phòng hóa hoàn toàn chất béo X, thu được glixerol và hai muối là natri oleat và natri stearat. Số công thức cấu tạo của X là
A. 5
B. 2
C. 3
D. 4 Đáp án là: C. 3 </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
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30030,
865,
325,
31280,
29875,
274,
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298,
228,
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29875,
29901,
1060,
29874,
30712,
282,
1251,
30712,
865,
5089,
30103,
29874,
5089,
... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Số lượng NST trong bộ nhiễm sắc thể lưỡng bội của loài phản ánh
A. Mức độ tiến hoá của loài.
B. Mối quan hệ họ hàng giữa các loài.
C. Tính đặc trưng của bộ NST ở mỗi loài.
D. Số lượng gen của mỗi loài. Đáp án là: C. Tính đặc trưng của bộ NST ở mỗi loài. </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
1105,
31500,
30103,
8092,
207,
158,
29877,
207,
158,
31214,
865,
40... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Hàm số nào sau đây có giá trị nhỏ nhất tại x=3/4?
A. y=4x^2-3x+1
B. y=-x^2+3/2x+1
C. y=-2x^2+3x+1
D. y=x^2-3/2x+1 Đáp án là: D. y=x^2-3/2x+1 </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
379,
30001,
29885,
269,
30984,
302,
30001,
29877,
12507,
29871,
30128... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Chất nào dưới đây tạo kết tủa trắng với dung dịch brom?
A. Alanin
B. Phenol
C. Metyl amin
D. Vinyl axetat Đáp án là: B. Phenol </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
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30030,
865,
325,
31280,
29875,
274,
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298,
228,
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29875,
29901,
16579,
31500,
30103,
29873,
1055,
30712,
29877,
868,
207,
158,
29877,... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho 6,...45 > 6, 52. Giá trị thích hợp là
A. 8
B. 6
C. 4
D. 3 Đáp án là: B. 6 </s> | [
1,
1,
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29871,
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29976,
29886,
29871,
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865,
325,
31280,
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274,
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298,
228,
190,
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29875,
29901,
14542,
29871,
29953,
29892,
856,
29946,
29945,
1405,
29871,
29953,
29... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho các chất: NaHCO 3, Al 2 O 3, Al 2 (SO 4 ) 3, Zn(OH) 2, NaHS, K 2 SO 3, (NH 4 ) 2 CO 3. Số chất vừa phản ứng được với dung dịch HCl vừa phản ứng được với dung dịch NaOH là
A. 7.
B. 5.
C. 6.
D. 4. Đáp án là: B. 5. </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
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29976,
29886,
29871,
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865,
325,
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29875,
29901,
14542,
5777,
30103,
29883,
10329,
31500,
30103,
29873,
29901,
4465,
2... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Chiếu ánh sáng trắng có bước sóng biến đổi từ 0, 38 μ m đến 0, 76 μ m vào khe S trong thí nghiệm giao thoa Young, khoảng cách từ hai nguồn đến màn là 2m, khoảng cách giữa hai nguồn là 2mm. Số bức xạ cho vân sáng tại M trên màn cách vân trung tâm 4mm là:
A. 5
B. 4
C. 6
D. 7 Đáp án là: A. 5 </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
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30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
678,
347,
31500,
30103,
29884,
263,
30103,
29876,
29882,
872,
30103,
... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: The hydraulic system of reservoirs ___ ___ __.
A. supplied irrigation from the Indian Ocean
B. helped transport the sandstone for constructing temples
C. were destroyed by nearby warrior’s tribes
D. became non–functional due to overuse Đáp án là: D. became non–functional due to overuse </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
450,
27246,
336,
352,
293,
1788,
310,
620,
261,
7869,
29879,
903,
... | [
1,
1,
1,
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1,
1,
1,
1,
1,
1,
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1,
1,
1,
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1,
1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: He borrowed money_______ he could finish his education.
A. that
B. so that
C. such as
D. too Đáp án là: B. so that </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
940,
27942,
287,
6909,
7652,
22359,
540,
1033,
8341,
670,
9793,
298... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
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1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Ở một quần thể thực vật ngẫu phối, alen đột biến a làm cây bị chết từ giai đoạn còn hai lá mầm; alen trội A quy định kiểu hình bình thường. Ở một locut gen khác có alen B quy định hoa màu đỏ trội hoàn toàn so với alen b quy định hoa màu trắng. Hai cặp gen nằm trên hai cặp NST thường phân ly độc lập với nhau. Ở một thế hệ (quần thể F1), người ta nhận thấy có 4% số cây bị chết từ giai đoạn hai lá mầm, 48,96% số cây sống và cho hoa màu đỏ, 47,04% số cây sống và cho hoa màu trắng. Biết quần thể ở trạng thái cân bằng đối với gen quy định màu hoa, không có đột biến mới phát sinh. Theo lý thuyết, tỷ lệ cây thuần chủng về cả hai cặp gen trên ở quần thể trước đó (quần thể P) là:
A. 5,4 %
B. 5,76%
C. 37,12%
D. 34,8% Đáp án là: D. 34,8% </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
438,
207,
158,
207,
140,
2730,
31214,
31500,
29873,
439,
29874,
315... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
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