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<s> Chọn đáp án đúng với câu hỏi: Read the passage carefully, then choose the correct answers. The dramatic growth of the world's population in the twentieth century was on a scale without parallel in human history. Most of this growth had occurred since 1950 and was known as the population 'explosion'. Between 1950 and 1980 the world population increased from 2.5 to over 4 billion, and by the end of the twenty century the figure had risen to about 6.6 billion. Growth of this size cannot continue indefinitely. Recent forecasts suggest that the total population will level out at between 10 and 15 billion in the mid twenty first century. Already there are encouraging signs that the rate of increase in many less developed countries is beginning to slow down. In 2000, the world's population was about ______.
A. four billion
B. six billion
C. ten billion
D. fifteen billion Đáp án là: B. six billion </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nguồn năng lượng sinh ra nội lực chủ yếu là
A. năng lượng của bức xạ Mặt Trời.
B. năng lượng ở trong lòng Trái Đất.
C. năng lượng do con người gây ra.
D. năng lượng từ các vụ nổ thiên thể. Đáp án là: B. năng lượng ở trong lòng Trái Đất. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một bình kín chứa hỗn hợp X gồm hiđro (0,195 mol), axetilen (0,150 mol), vinyl axetilen (0,120 mol) và một ít bột Ni. Nung nóng bình một thời gian thu được hỗn hợp khí Y có tỉ khối hơi so với hidro bằng 19,5. Khí Y phản ứng vừa đủ với dung dịch chứa 0,21 mol AgNO 3 trong NH 3 thu được m gam kết tủa và 3,024 lít hỗn hợp khí Z (đktc). Khí Z phản ứng tối đa với 0,165 mol Br 2 trong dung dịch. Giá trị của m là:
A. 55,2.
B. 52,5.
C. 27,6.
D. 82,8. Đáp án là: C. 27,6. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Etanol là chất tác động đến thần kinh trung ương. Khi hàm lượng etanol trong máu tăng sẽ có hiện tượng nôn, mất tỉnh táo và có thể gây tử vong. Tên gọi khác của etanol là
A. axit fomic.
B. phenol.
C. etanal.
D. ancol etylic. Đáp án là: D. ancol etylic </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Quá trình đô thị hóa hiện nay ở nước ta phát triển chủ yếu là do
A. thu hút được nhiều đầu tư nước ngoài.
B. nền kinh tế chuyển sang cơ chế thị trường.
C. quá trình hội nhập quốc tế và khu vực.
D. quá trình công nghiệp hóa được đẩy mạnh. Đáp án là: D. quá trình công nghiệp hóa được đẩy mạnh </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất nào sau đây oxi hóa được H 2 O?
A. F 2
B. C l 2
C. B r 2
D. I 2 Đáp án là: A. F 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hiđrocacbon X phản ứng với brom (trong dung dịch) theo tỉ lệ mol 1 : 1, thu được chất hữu cơ Y (chứa 74,08% Br về khối lượng). Khi X phản ứng với HBr thì thu được hai sản phẩm hữu cơ khác nhau. Tên gọi của X là
A. but-1-en
B. but-2-en
C. Propilen
D. Xiclopropan Đáp án là: A. but-1-en </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khối lượng vận chuyển hàng hoá bằng loại hình giao thông vận tải nào sau đây thấp nhất?
A. Đường sông.
B. Đường ô tô.
C. Đường hàng không.
D. Đường biển. Đáp án là: C. Đường hàng không. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điền số thích hợp vào ô trống
Chục nghìn
Nghìn
Trăm
Chục
Đơn vị
Viết số
Đọc số
2
8
5
6
4?
Hai mươi tám nghìn năm trăm sáu mươi tư
A. 28 564
B. 28 654
C. 46 582
D. 25 640 Đáp án là: A. 28 564 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khối lượng súng là 4 kg và của đạn là 50 g. Lúc thoát khỏi nòng súng, đạn có vận tốc 800 m/s. Vận tốc giật lùi của súng là bao nhiêu nếu chọn chiều dương là chiều giật lùi của súng.
A. 6 m/s.
B. 7 m/s.
C. 10 m/s.
D. 12 m/s. Đáp án là: C. 10 m/s. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tại sao khi chùm tia sáng mặt trời đi qua một tâm thủy tinh phẳng lại không thấy bị tán sắc thành những màu cơ bản?
A. Vì tấm thủy tinh không phải là lăng kính nên không làm tán sắc ánh sáng trắng
B. Vì sau khi bị tán sắc, các tia màu đi qua tấm thủy tinh và ló ra ngoài dưới dạng những chùm tia chồng chất lên nhau nên tạo thành ánh sáng trắng.
C. Vì ánh sáng mặt trời chiếu tới không phải là sóng kết hợp nên không bị tấm thủy tinh làm tán sắc.
D. Vì thủy tinh không làm tán sắc ánh sáng trắng Đáp án là: B. Vì sau khi bị tán sắc, các tia màu đi qua tấm thủy tinh và ló ra ngoài dưới dạng những chùm tia chồng chất lên nhau nên tạo thành ánh sáng trắng. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Xà phòng hóa hoàn toàn 0,3 mol (C 17 H 35 COO) 3 C 3 H 5 trong dung dịch KOH dư thu được m gam muối. Giá trị của m là
A. 264,6 gam
B. 96,6 gam
C. 88,2 gam
D. 289,8 gam Đáp án là: D. 289,8 gam </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất sau: (1) C 2 H 6, (2) CH 3 -CH(NH 2 )-COOH, (3) CH 3 COOH, (4) C 2 H 5 OH. Dãy sắp xếp nhiệt độ sôi theo thứ tự giảm dần là
A. (2) > (3) > (4) > (1).
B. (3) > (4) > (1) > (2).
C. (4) > (3) > (2) > (1).
D. (2) > (3) > (1) > (4). Đáp án là: A. (2) > (3) > (4) > (1). </s> | [
1,
1,
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<s> Chọn đáp án đúng với câu hỏi: If they go to the disco, they ______to loud music.
A. listen
B. listens
C. will listen
D. are listening Đáp án là: A. listen </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chia 20,8 gam hỗn hợp gồm hai anđehit đơn chức là đồng đẳng kế tiếp thành hai phần bằng nhau. Phần một tác dụng hoàn toàn với lượng dư dung dịch AgNO 3 trong NH 3 đun nóng, thu được 108 gam Ag. Phần hai tác dụng hoàn toàn với H 2 dư (xúc tác Ni, t°), thu được hỗn hợp X gồm hai ancol Y và Z (M y <M Z ). Đun nóng X với H 2 SO 4 đặc ở 140°C, thu được 4,52 gam hỗn hợp ba ete. Biết hiệu suất phản ứng tạo ete của Y bằng 50%. Hiệu suất phản ứng tạo ete của Z bằng
A. 40%.
B. 60%.
C. 30%.
D. 50%. Đáp án là: B. 60%. </s> | [
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3047... | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Nhân tố hàng đầu quyết định mọi thắng lợi của cách mạng Việt Nam từ năm 1930 đến năm 2000 là
A. Tinh thần yêu nước của nhân dân Việt Nam
B. tinh thần đoàn kết giữa ba nước Đông Dương.
C. sự ủng hộ của Liên Xô, Trung Quốc...
D. sự lãnh đạo của Đảng với đường lối đúng đắn Đáp án là: D. sự lãnh đạo của Đảng với đường lối đúng đắn </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Nung nóng 30,52 gam hỗn hợp rắn gồm Ba(HCO 3 ) 2 và NaHCO 3 đến khi khối lượng không đổi thu được 18,84 gam rắn X và hỗn hợp Y chứa khí và hơi. Cho toàn bộ X vào lượng nước dư, thu được dung dịch Z. Hấp thụ 1⁄2 hỗn hợp Y vào dung dịch Z, thu được dung dịch T chứa m gam chất tan. Giá trị của m là
A. 14,64.
B. 17,45.
C. 16,44.
D. 15,20. Đáp án là: C. 16,44. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Phân thức đối của phân thức (5x+3y)/(5x-3y) là:
A. (5x-3y)/(5x+3y)
B. (-(5x+3y))/(5x+3y)
C. 1
D. -1 Đáp án là: B. (-(5x+3y))/(5x+3y) </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: We spent half an hour looking for the keys, but eventually ________ and went home.
A. passed down
B. went by
C. gave up
D. put off Đáp án là: C. gave up </s> | [
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1334,
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363,
278,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Forward or backward behavior reveals an active or a passive (8) __________ to what is being said.
A. reaction
B. opinion
C. behavior
D. knowledge Đáp án là: A. reaction </s> | [
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29901,
1152,
1328,
470,
1250,
1328,
6030,
10320,
1338,
385,
6136,
470,
263... | [
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Bán hoang mạc ôn đới phát triển ở
A. Cao nguyên Pa-ta-gô-ni.
B. Miền núi An-đét.
C. Quần đảo Ảng-ti.
D. Eo đất phía tây Trung Mĩ. Đáp án là: A. Cao nguyên Pa-ta-gô-ni. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hình chóp S.ABCD có đáy ABCD là hình bình hành tâm O, I là trung điểm cạnh SC. Xét các mệnh đề:
(I). Đường thẳng IO song song SA.
(II). Mặt phẳng (IBD) cắt hình chóp S.ABCD theo thiết diện là một tứ giác.
(III). Giao điểm của đường thẳng AI và mặt phẳng (SBD) là trọng tâm tam giác SBD.
(IV). Giao tuyến hai mặt phẳng (IBD) và (SAC) là OI.
Số mệnh đề đúng trong các mệnh đề trên là:
A. 4
B. 2
C. 3
D. 1 Đáp án là: B. 2 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Tác giả Chu Quang Tiềm tên khai sinh là gì?
A. Chu Chương Thọ
B. Bạch Thọ Di
C. Tự Mạnh Thực
D. Tào Ngu Đáp án là: C. Tự Mạnh Thực </s> | [
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Bộ phận nào của não là trạm cuối cùng chuyển tiếp của tất cả các đường truyền cảm giác từ dưới đi lên não
A. Cầu não
B. Tiểu não
C. Não giữa
D. Não trung gian Đáp án là: D. Não trung gian </s> | [
1,
1,
29871,
678,
30975,
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29871,
30128,
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29886,
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1,
1,
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1,
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1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho bảng số liệu: SẢN LƯỢNG MỘT SỐ SẢN PHẨM CÔNG NGHIỆP HOA KÌ GIAI ĐOẠN 2004 – 2015 Dựa vào bảng số liệu để thể hiện tốc độ tăng trưởng một số sản phẩm công nghiệp của Hoa Kì giai đoạn 2004 - 2015, dạng biểu đồ nào thích hợp nhất?
A. Biểu đồ cột.
B. Biểu đồ đường.
C. Biểu đò tròn.
D. Biểu đồ miền. Đáp án là: B. Biểu đồ đường. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho phản ứng hóa học Cl 2 + Ca(OH) 2 → CaOCl 2 + H 2 O. Phản ứng này thuộc loại phản ứng
A. Oxi hóa – khử.
B. Trao đổi.
C. Trung hòa.
D. Hóa hợp. Đáp án là: A. Oxi hóa – khử. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tại điểm phản xạ thì sóng phản xạ
A. luôn ngược pha với sóng tới
B. ngược pha với sóng tới nếu vật cản là cố định
C. ngược pha với sóng tới nếu vật cản là tự do
D. cùng pha với sóng tới nếu vật cản là cố định Đáp án là: B. ngược pha với sóng tới nếu vật cản là cố định </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một quần thể cây trồng đạt trạng thái cân bằng di truyền có số cây hoa vàng chiếm 36%. Biết rằng, tính trạng màu sắc hoa do 1 gen quy định, trong đó A quy định hoa đỏ trội hoàn toàn so với a quy định hoa vàng. Tần số tương đối của mỗi alen trong quần thể là:
A. A = 0,6 ; a = 0,4
B. A = 0,4 ; a = 0,6
C. A = 0,8 ; a = 0,2
D. A = 0,2 ; a = 0,8 Đáp án là: B. A = 0,4 ; a = 0,6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để cây phát triển tốt, trong khâu chăm sóc, chúng ta cần chú trọng điều gì?
A. Phòng chống sâu bệnh, chống nóng, chống rét cho cây
B. Bón phân đúng loại, đúng thời điểm, đúng hàm lượng
C. Tưới tiêu hợp lí
D. Tất cả các phương án đưa ra Đáp án là: D. Tất cả các phương án đưa ra </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Công suất của nguồn điện có suất điện động E, điện trở trong r khi dòng điện có cường độ I chạy qua được tính bằng công thức:
A. P = E r
B. P = E.I
C. P = E I
D. P = EI r Đáp án là: B. P = E.I </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hormone florigen có tác dụng
A. Kích thích nảy chồi
B. Kích thích ra hoa
C. Kích thích phát triển rễ
D. Kích thích nảy mầm Đáp án là: B. Kích thích ra hoa </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho kim loại M tạo ra hợp chất \[MS{O_4}\]. Biết phân tử khối là 120. Xác định kim loại M:
A. Magie;
B. Đồng;
C. Sắt;
D. Bạc. Đáp án là: A. Magie; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong mạch dao động lí tưởng LC. Lúc t 0 = 0 bản tụ A tích điện dương, bản tụ B tích điện âm và chiều dòng điện đi qua cuộn cảm từ B sang A. Sau 3/4 chu kì dao động của mạch thì
A. dòng điện đi theo chiều từ B đến A, bản A tích điện âm
B. dòng điện đi theo chiều từ B đến A, bản A mang điện dương
C. dòng điện qua L theo chiều từ A đến B, bản A tích điện âm
D. dòng điện đi theo chiều từ A đến B, bản A tích điện dương Đáp án là: A. Sau 3/4 chu kì dao động của mạch thì </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi quan sát một vật bằng kính lúp, để mắt nhìn thấy một ảnh ảo lớn hơn vật ta cần phải:
A. đặt vật ngoài khoảng tiêu cự
B. đặt vật trong khoảng tiêu cự
C. đặt vật sát vào mặt kính
D. đặt vật bất cứ vị trí nào Đáp án là: B. đặt vật trong khoảng tiêu cự </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Xét dao động tổng hợp cuả hai dao động thành phần có cùng phương và cùng tần số. Biên độ của dao động tổng hợp không phụ thuộc
A. biên độ của dao động thành phần thứ nhất
B. biên độ của dao động thành phần thứ hai
C. tần số chung của hai dao động thành phần
D. độ lệch pha của hai dao động thành phần Đáp án là: C. tần số chung của hai dao động thành phần </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây là không đúng?
A. Cường độ dòng điện trong đoạn mạch chỉ chứa điện trở R tỉ lệ với hiệu điện thế U giữa hai đầu đoạn mạch và tỉ lệ nghịch với điện trở R
B. Cường độ dòng điện trong mạch kín tỉ lệ thuận với suất điện động của nguồn điện và tỉ lệ nghịch với điện trở toàn phàn của mạch
C. Công suất của dòng điện chạy qua đoạn mạch bằng tích của hiệu điện thế giữa hai đầu đoạn mạch và cường độ dòng điện chạy qua đoạn mạch đó
D. Nhiệt lượng toả ra trên một vật dẫn tỉ lệ thuận với điện trở của vật, với cường độ dòng điện và với thời gian dòng điện chạy qua vật Đáp án là: D. Nhiệt lượng toả ra trên một vật dẫn tỉ lệ thuận với điện trở của vật, với cường độ dòng điện và với thời gian dòng điện chạy qua vật </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai điện tích q 1 < 0 và q 2 > 0 với | q 2 | > | q 1 | lần lượt đạt tại A và B như hình vẽ (I là trung điểm của AB). Điểm M có độ lớn điện trường tổng hợp do hai điện tích này gây ra bằng 0 nằm trên
A. AI.
B. IB.
C. By
D. Ax. Đáp án là: D. Ax </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Ancol no, đơn chức, mạch hở có 10 nguyên tử H trong phân tử có số đồng phân là
A. 5.
B. 3.
C. 4.
D. 2. Đáp án là: C. 4. </s> | [
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521,
2... | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một bình hình trụ chứa một lượng nước, chiều cao của cột nước là 3m, trọng lượng riêng của nước d = 10000 N/m 3. Áp suất của nước tại những điểm cách mặt thoáng 1,8 m là
A. 18000 N/m 2
B. 10000 N/m 2
C. 12000 N/m 2
D. 30000 N/m 2 Đáp án là: D. 30000 N/m 2 </s> | [
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Để khử ion Fe 3+ trong dung dịch thành ion Fe 2+ có thể dùng một lượng dư
A. kim loại Ba
B. kim loại Mg
C. kim loại Ag
D. kim loại Cu Đáp án là: D. kim loại Cu </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: So với năm 1990, dân số năm 2010 của Trung Quốc tăng gấp gần
A. 1,1 lần.
B. 1,2 lần.
C. 1,3 lần.
D. 1,4 lần. Đáp án là: B. 1,2 lần. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Trong các hiện tượng sau hiện tượng nào không liên quan đến sự nóng chảy?
A. Băng ở Nam Cực ta ra vào mùa hè
B. Đốt một ngọn nến
C. Đúc một cái chuông đồng
D. Đốt một ngọn đèn dầu Đáp án là: D. Đốt một ngọn đèn dầu </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Sophia will wear this dress ______.
A. after she had attended her best friend’s wedding
B. while she was attending her best friend’s wedding
C. as she attends her best friend’s wedding
D. when she attended her best friend’s wedding Đáp án là: C. as she attends her best friend’s wedding </s> | [
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Phân số thập phân 2/10 được viết thành số thập phân.
A. 0,02
B. 0,2
C. 0,002
D. 20 Đáp án là: B. 0,2 </s> | [
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1,
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Most people are afraid of being operated on______.
A. in spite of improvements in modem surgery.
B. because they think modern drugs are dangerous.
C. because they do not believe they need anesthetics.
D. unless it is an emergency operation. Đáp án là: A. in spite of improvements in modem surgery. </s> | [
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Để hút hết nước ở một cái hồ, người ta phải dùng 4 máy bơm làm việc liên tục trong 10 giờ. Vì muốn công việc hoàn thành sớm hơn nên người ta đã dùng 8 máy bơm như thế. Hỏi sau mấy giờ sẽ hút hết nước ở hồ đó?
A. 4 giờ
B. 5 giờ
C. 12 giờ
D. 20 giờ Đáp án là: B. 5 giờ </s> | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: The word “ it ” in paragraph 1 refers to _____.
A. heart condition
B. upbeat disposition
C. premature death
D. exceptional longevity Đáp án là: B. upbeat disposition </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Do địa hình bị chia cắt, nên khu vực đồi núi nước ta
A. trở ngại về giao thông.
B. có nhiều lũ quét, xói mòn đất.
C. thường xảy ra trượt lở đất.
D. có nguy cơ phát sinh động đất. Đáp án là: A. trở ngại về giao thông. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Giá trị của biểu thức 45 + 27 : 3 là:
A. 24
B. 36
C. 54
D. 55 Đáp án là: C. 54 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho 5,4 gam Al tác dụng vừa đủ với oxi thu được nhôm oxit Al 2 O 3. Tính khối lượng Al 2 O 3 tạo thành.
A. 5,1 gam;
B. 10,2 gam;
C. 1,2 gam;
D. 20,4 gam. Đáp án là: B. 10,2 gam; </s> | [
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1,
1,
1,
1,
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1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Có bao nhiêu phát biểu dưới đây là sai khi nói về giao phối ngẫu nhiên? 1. Giao phối ngẫu nhiên không làm biến đổi thành phần kiểu gen và tần số tương đối của các alen trong quẩn thể. 2. Giao phối ngẫu nhiên tạo ra các biến dị tổ hợp, góp phần trung hòa tính có hại của đột biến. 3. Giao phối ngẫu nhiên tạo ra các kiểu gen mới, cung cấp nguồn nguyên liệu sơ cấp cho quá trình tiến hóa. 4. Giao phối ngẫu nhiên không phải là một nhân tố tiến hóa.
A. 3
B. 1
C. 2
D. 4 Đáp án là: B. 1 </s> | [
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1,
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1,
1,
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1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một đột biến gen xảy ra do thay thế một cặp nuclêôtit có thể không làm thay đổi khả năng thích nghi của cơ thể sinh vật. Có bao nhiêu trường hợp đột biến sau đây có thể không đảm bảo được khả năng đó? I. Đột biến xảy ra ở mã mở đầu của một gen thiết yếu. II. Đột biến thay thế 1 cặp nuclêôtit làm bộ ba mã hóa này chuyển thành một bộ ba mã hóa khác, nhưng cả hai bộ ba đều cùng mã hóa cho một loại axit amin. III. Đột biến thay thế 1 cặp nuclêôtit làm xuất hiện một bộ ba mã hóa mới, dẫn đến sự thay đổi một axit amin trong phân tử prôtêin, làm thay đổi chức năng và hoạt tính của prôtêin. IV. Đột biến thay thế nuclêôtit xảy ra trong vùng không mã hóa của gen. V. Đột biến làm xuất hiện bộ ba 3’ATT5’ ở mạch mã gốc trong vùng mã hóa gần bộ ba mở đầu.
A. 2
B. 1
C. 4
D. 3 Đáp án là: D. 3 </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 sentence that best completes each of the following exchanges. Student A: “Both genders should be given equal rights to education, employment and healthcare.” Student B: “ ______________”
A. So do I.
B. I couldn’t think.
C. That’s meaningful.
D. I absolutely agree with you. Đáp án là: D. I absolutely agree with you </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây sai khi nói về pha sáng của quá trình quang hợp?
A. trong pha sáng diễn ra quá trình quang phân li nước
B. một trong những sản phẩm của pha sáng là NADH
C. pha sáng là pha chuyển hóa năng lượng của ánh sáng đã được diệp lục hấp thụ thành năng lượng của các liên kết hóa học trong ATP và NADPH
D. Ở thực vật, pha sáng diễn ra trên màng tilacoit của lục lạp Đáp án là: B. một trong những sản phẩm của pha sáng là NADH </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong mặt phẳng tọa độ Oxy, phương trình tổng quát của đường thẳng d có vectơ pháp tuyến n→=(3;5) và đi qua điểm N(2; –1) là
A. 3x + 5y – 1 = 0;
B. 3x + 5y + 1 = 0;
C. 5x + 3y –1 = 0;
D. 3x – 5y + 1 = 0. Đáp án là: A. 3x + 5y – 1 = 0; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các chuyển động chính của Trái Đất là:
A. Tịnh tiến và quay xung quanh Mặt Trăng.
B. Tự quay và quay xung quanh Mặt Trời.
C. Tịnh tiến và quay xung quanh Mặt Trời.
D. Tự quay và quay xung quanh Mặt Trăng. Đáp án là: B. Tự quay và quay xung quanh Mặt Trời. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về mức sinh sản và mức tử vong của quần thể, có bao nhiêu phát biểu sau đây đúng? I. Mức tử vong là số cá thể của quần thể bị chết trong một khoảng thời gian nhất định. II. Mức sinh sản là số cá thể mới được sinh ra trong một khoảng thời gian nhất định. III. Mức sinh sản giảm và mức tử vong tăng là nguyên nhân làm tăng kích thước quần thể sinh vật. IV. Khi không có di cư, nhập cư thì quần thể tự điều chỉnh số lượng cá thể thông qua việc điều chỉnh tỷ lệ sinh sản, tử vong
A. 2
B. 3
C. 1
D. 4 Đáp án là: B. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chiếu một ánh sáng đơn sắc từ chân không vào một khối chất trong suốt với góc tới 45 ̊ thì góc khúc xạ bằng 30 ̊. Chiết suất tuyệt đối của môi trường này bằng
A. 2
B. 1, 5
C. 2
D. 3 Đáp án là: A. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 19, hãy cho biết hai tỉnh có số lượng trâu và bò (năm 2007) lớn nhất nước ta?
A. Quảng Ngãi, Thanh Hóa.
B. Thanh Hóa, Bình Định.
C. Thanh Hóa, Nghệ An.
D. Nghệ An, Quảng Nam. Đáp án là: C. Thanh Hóa, Nghệ An. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất nào sau đây là chất điện li yếu khi hòa tan trong nước?
A. H 2 S
B. Ba(OH) 2
C. HCl
D. Na 2 SO 4 Đáp án là: A. H 2 S </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đồ thị biểu diễn sự biến thiên của bình phương vận tốc theo li độ trong dao động điều hoà có hình dạng nào sau đây
A. Đường elip
B. Một phần đường hypebol
C. Đường tròn
D. Một phần đường parabol Đáp án là: D. Một phần đường parabol </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai điểm \[M\left( {5; - 7} \right)\] và \[M'\left( { - 5; - 7} \right)\] đối xứng nhau qua:
A. Trục \[Ox\]
B. Điểm \[O\left( {0;0} \right)\]
C. Điểm \[I\left( {5;0} \right)\]
D. Trục \[Oy\] Đáp án là: D. Trục \[Oy\] </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The word “ insulation ” in paragraph 3 mostly means _______.
A. devices that monitor changes in temperature
B. panels that convert solar energy into electricity
C. materials that prevent heat loss and absorption
D. systems that protect buildings from the sun’s rays Đáp án là: C. materials that prevent heat loss and absorption </s> | [
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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: etyl axetat, anilin, ancol (rượu) etylic, axit acrylic, phenol, phenylamoni clorua, ancol (rượu) benzylic, p-crezol. Trong các chất này, số chất tác dụng được với dung dịch NaOH là :
A. 4
B. 3
C. 5
D. 6 Đáp án là: C. 5 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: What chemical is this? It’s______a horrible smell.
A. giving over
B. giving off
C. giving down
D. giving up Đáp án là: B. giving off </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Từ glucozơ, có thể điều chế cao su buna theo sơ đồ sau đây: Glucozơ → ancol etylic → buta-1,3-đien → cao Su Buna. Biết hiệu suất của quá trình điều chế là 75%, muốn thu được 32,4 kg cao su thì khối lượng glucozơ cần dùng là
A. 144 kg
B. 108 kg
C. 81 kg
D. 96 kg Đáp án là: A. 144 kg </s> | [
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<s> Chọn đáp án đúng với câu hỏi: I’m glad that they see eye to eye on the matter of the conference location.
A. disagree
B. agree
C. regret
D. deny Đáp án là: A. disagree </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất tác dụng với nước tạo ra dung dịch axit là
A. K 2 O.
B. C u O.
C. P 2 O 5.
D. C a O. Đáp án là: C. P 2 O 5. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Anne: “ Fancy a bite to eat?” Barbara: “_____”
A. No thanks, I've just had some.
B. No thanks, I've just had something.
C. No thanks, I'm not neatly very thirsty.
D. No thanks, I'm trying to give up. Đáp án là: C. No thanks, I'm not neatly very thirsty. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Toàn bộ đồng bằng Pam-pa là
A. Một thảo nguyên rộng mênh mông.
B. Một đồng bằng nông nghiệp trù phú.
C. Một cách đồng lúa mì mênh mông.
D. Một cánh đồng hoa quả nhiệt đới rộng lớn. Đáp án là: A. Một thảo nguyên rộng mênh mông. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phần trắc nghiệm Đặc điểm nào sau đây không phải là đặc điểm của địa hình nước ta:
A. Đồi núi chiếm 3 4 diện tích cả nước.
B. Đồi núi thấp chiếm gần 60% diện tích cả nước.
C. Đồng bằng chiếm 2/3 diện tích.
D. Địa hình có sự phân hóa đa dạng thành nhiều khu vực Đáp án là: C. Đồng bằng chiếm 2/3 diện tích. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giả sử dưới tác động của một nhân tố, tần số tương đối của các alen ở một quần thể từ 0,5A : 0,5a đột ngột biến đổi thành 0,7A : 0,3a. Nhân tố nào sau đây có khả năng đã tác động vào quần thể này? (1) Đột biến. (2) Giao phối ngẫu nhiên. (3) Di - nhập gen. (4) Giao phối không ngẫu nhiên. (5) Các yếu tố ngẫu nhiên. (6) Các cơ chế cách li. (7) Chọn lọc tự nhiên.
A. (1) hoặc (3) hoặc (6).
B. (5) hoặc (6) hoặc (7).
C. (3) hoặc (5) hoặc (7).
D. (1) hoặc (2) hoặc (6). Đáp án là: C. (3) hoặc (5) hoặc (7). </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Từ “có lẽ” trong câu “những hành trang ấy, có lẽ sự chuẩn bị về con người là quan trọng nhất” là thành phần gì?
A. Thành phần trạng ngữ
B. Thành phần bổ ngữ
C. Thành phần biệt lập tình thái
D. Thành phần biệt lập cảm thán Đáp án là: C. Thành phần biệt lập tình thái </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Loại hạt nào dưới đây không chứa phôi nhũ?
A. Cau
B. Lúa
C. Ngô
D. Lạc Đáp án là: D. Lạc </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai lực của một ngẫu lực có độ lớn F = 5,0 N. Cánh tay đòn của ngẫu lực d = 20 cm. Momen của ngẫu lực là:
A. 100 N.m
B. 2,0 N.m
C. 0,5 N.m
D. 1,0 N.m Đáp án là: D. 1,0 N </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi giặc đến, đất nước rơi vào tình thế như thế nào?
A. Trong tư thế sẵn sàng chiến đấu với kẻ thù
B. Đang phòng thủ, chuẩn bị lực lượng chiến đấu
C. Tình thế bất ngờ, thất thế, mất chủ động
D. Tất cả các đáp án trên Đáp án là: C. Tình thế bất ngờ, thất thế, mất chủ động </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Which of the following statement is TRUE?
A. Auditory learners hate taking notes.
B. Auditory learners prefer listening to speaking.
C. Most people are auditory learners.
D. When learning something by heart, an auditory learner prefers reading it out loud. Đáp án là: D. When learning something by heart, an auditory learner prefers reading it out loud </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Công nghiệp trọng điểm không phải là ngành
A. có thế mạnh lâu dài.
B. mang lại hiệu quả cao về kinh tế, xã hội, môi trường.
C. có tác động mạnh mẽ đến các ngành kinh tế khác.
D. ra đời sau công cuộc Đổi mới nền kinh tế - xã hội đất nước. Đáp án là: D. ra đời sau công cuộc Đổi mới nền kinh tế - xã hội đất nước </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một số nhà máy, người ta thường xây dựng những ống khói rất cao vì
A. ống khói cao có tác dụng tạo ra sự truyền nhiệt tốt
B. ống khói cao có tác dụng tạo ra sự bức xạ nhiệt tốt
C. ống khói cao có tác dụng tạo ra sự đối lưu tốt
D. ống khói cao có tác dụng tạo ra sự dẫn nhiệt tốt Đáp án là: C. ống khói cao có tác dụng tạo ra sự đối lưu tốt </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the letter A, B, C or D to complete the sentences The more times I watch Nguyen Thi Thuy Hien compete in wushu competition, ____________________.
A. I admire her more
B. more than I admire her
C. the more I admire her
D. admirer her was I Đáp án là: C. the more I admire her </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vào ngày 22 tháng 6, nửa cầu Bắc chúc về phía Mặt Trời nhiều nhất và có diện tích được chiếu sáng rộng nhất nên có
A. ngày dài đêm ngắn.
B. ngày ngắn đêm dài.
C. Ngày, đêm khó xác định.
D. ngày đêm bằng nhau. Đáp án là: A. ngày dài đêm ngắn. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vai trò của Tổng thống Nen-xơn Man-đê-la đối với Nam Phi là
A. người tích cực đấu tranh chống chế độ A-pác-thai.
B. người lãnh đạo đấu tranh chống chế đọ A-pác-thai.
C. người lãnh đạo nhân dân và tích cực đấu tranh chống chế độ A-pác-thai.
D. người chỉ đạo nhân dân và tích cực đấu tranh chống chế độ A-pác-thai. Đáp án là: C. người lãnh đạo nhân dân và tích cực đấu tranh chống chế độ A-pác-thai. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
A. million s
B. chore s
C. factorie s
D. pessimist s Đáp án là: D. pessimist s </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây là đúng với nội dung của quy tắc nắm tay phải?
A. Nắm ống dây bằng tay phải sao cho bốn ngón tay nắm lại chỉ chiều dòng điện qua ống dây thì ngón tay cái choãi ra chỉ chiều đường sức từ trong lòng ống dây.
B. Nắm ống dây bằng tay phải sao cho bốn ngón tay nắm lại chỉ chiều dòng điện qua ống dây thì ngón tay cái choãi ra chỉ chiều đường sức từ bên ngoài ống dây.
C. Nắm ống dây bằng tay phải khi đó bốn ngón tay nắm lại chỉ chiều đường sức từ trong lòng ống dây.
D. Nắm ống dây bằng tay phải khi đó ngón tay cái choãi ra chỉ chiều đường sức từ trong lòng ống dây. Đáp án là: A. Nắm ống dây bằng tay phải sao cho bốn ngón tay nắm lại chỉ chiều dòng điện qua ống dây thì ngón tay cái choãi ra chỉ chiều đường sức từ trong lòng ống dây. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho sơ đồ chuyển hóa sau: X → + CH 3 OH / HCl, t o Y → + C 2 H 5 OH / HCl, t o Z → + NaOH du, t o T Biết X là axit glutamic, Y, Z, T là các chất hữu cơ chứa nitơ. Công thức phân tử của Y và T là
A. C 6 H 12 O 4 N và C 5 H 7 O 4 Na 2 N.
B. C 7 H 15 O 4 NCl và C 5 H 8 O 4 Na 2 NCl.
C. C 6 H 12 O 4 NCl và C 5 H 7 O 4 Na 2 N.
D. C 7 H 14 O 4 NCl và C 5 H 7 O 4 Na 2 N. Đáp án là: C. C 6 H 12 O 4 NCl và C 5 H 7 O 4 Na 2 N. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi hầm thịt với dứa hoặc đu đủ thường nhanh mềm hơn vì
A. trong dứa hoặc đủ đủ có enzyme phân giải tinh bột.
B. trong dứa hoặc đủ đủ có enzyme phân giải lipid.
C. trong dứa hoặc đủ đủ có enzyme phân giải nucleic acid.
D. trong dứa hoặc đủ đủ có enzyme phân giải protein. Đáp án là: A. trong dứa hoặc đủ đủ có enzyme phân giải tinh bột. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. bin
B. paper
C. bag
D. bottle Đáp án là: B. paper </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dãy dung dịch nào sau đây đều làm quỳ tím chuyển qua màu xanh?
A. NH 3 và Na 2 CO 3
B. NaHSO 4 và NH 4 Cl.
C. Ca(OH) 2 và H 2 SO 4
D. NaAlO 2 và AlCl 3 Đáp án là: A. NH 3 và Na 2 CO 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: - Na là kim loại thuộc nhóm IA - Al là kim loại thuộc nhóm IIIA - Fe là kim loại thuộc nhóm VIIIB - Ca là kim loại thuộc nhóm IIA Đáp án cần chọn là: D
A. Na
B. Al
C. Fe
D. Ca Đáp án là: D. Ca </s> | [
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326,
658,
29874,
31214,
29875,
266,
256... | [
1,
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1,
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Four people were seriously ______ in the explosion.
A. wounded
B. pained
C. ached
D. sprained Đáp án là: A. wounded </s> | [
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Trộn 100ml dung dịch (gồm Ba(OH) 2 0,1M và NaOH 0,1M với 400 ml dung dịch (gồm H 2 SO 4 0,0375 M và HCl 0,0125 M) thu được dung dịch X, giá trị pH của dung dịch X là:
A. 1
B. 2
C. 6
D. 7 Đáp án là: B. 2 </s> | [
1,
1,
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29976,
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1,
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1,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Theo thống kê hằng năm rừng Amazon hấp thụ bao nhiêu phần trăm khí CO2 cho Trái Đất?
A. 10%
B. 20%
C. 30%
D. 40% Đáp án là: A. 10% </s> | [
1,
1,
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29876,
29871,
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29976,
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447,
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1... | [
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1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Nhật Bản tập trung vào các ngành công nghiệp đòi hỏi kĩ thuật cao là do
A. Có nguồn lao động dồi dào, thị trường tiêu thụ rộng lớn.
B. Hạn chế sử dụng nhiều nguyên liệu, lao động có trình độ cao, mang lại lợi nhuận lớn.
C. Không có khả năng nhập khẩu các sản phẩm chất lượng cao.
D. Có nguồn tài nguyên khoáng sản phong phú. Đáp án là: B. Hạn chế sử dụng nhiều nguyên liệu, lao động có trình độ cao, mang lại lợi nhuận lớn. </s> | [
1,
1,
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29876,
29871,
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29976,
29886,
29871,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Anken X có công thức cấu tạo: CH 3 −CH 2 −C(CH 3 )=CH−CH 3.Tên của X là
A. 2-etylbut-2-en
B. isohexan
C. 3-metylpent-2-en
D. 3-metylpent-3-en Đáp án là: C. 3-metylpent-2-en </s> | [
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530,
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15... | [
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Sản phẩm không phải chuyên môn hoá sản xuất của Bắc Trung Bộ là
A. trâu, bò thịt; thuỷ sản nước mặn, lợ.
B. cây công nghiệp hàng năm (lạc, mía, thuốc lá).
C. cây công nghiệp lâu năm (cà phê, cao su).
D. lúa cao sản, lúa có chất lượng cao. Đáp án là: D. lúa cao sản, lúa có chất lượng cao </s> | [
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Chất nào sau đây ảnh hưởng đến sinh trưởng và phát triển của phôi thai, gây dị tật ở trẻ em?
A. Rượu và vitamin
B. Ma túy, Thuốc bổ
C. Chất kích thích, chất gây nghiện
D. Đồ hộp Đáp án là: C. Chất kích thích, chất gây nghiện </s> | [
1,
1,
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29976,
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1,
1,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cơ chế nhân đôi của ADN trong nhân là cơ sở
A. Đ ưa đến sự nhân đôi của NST
B. Đ ưa đến sự nhân đôi của ti thể
C. Đ ưa đến sự nhân đôi của trung tử
D. Đ ưa đến sự nhân đôi của lạp thể Đáp án là: A. Đ ưa đến sự nhân đôi của NST </s> | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Đồng bằng sông Cửu Long bao gồm hai bộ phận nào sau đây?
A. Vùng thượng châu thổ và hạ châu thổ.
B. Vùng chịu tác động trực tiếp của sông Tiền, sông Hậu và vùng nằm ngoài phạm vi tác động đó.
C. Vùng cao không ngập nước và vùng trũng ngập nước.
D. Vùng chịu ảnh hưởng của thủy triều và vùng không chịu ảnh hưởng của thủy triều. Đáp án là: B. Vùng chịu tác động trực tiếp của sông Tiền, sông Hậu và vùng nằm ngoài phạm vi tác động đó. </s> | [
1,
1,
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865,
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1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: A. plum b er B. prescri b e C. succum b D. su b tle
A. plum b er
B. prescri b e
C. succum b
D. su b tle Đáp án là: B. prescri b e </s> | [
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1,
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29871,
30128,
29976,
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29871,
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325,
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319,
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398,
289,
604,
350,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Find the mistake in each of the following sentences. Found in the 12th century, Oxford University ranks among the world's oldest ones.
A. Found
B. ranks
C. among
D. ones Đáp án là: A. Found </s> | [
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325,
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274,
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228,
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29901,
10987,
278,
10171,
297,
1269,
310,
278,
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25260,
29889,
7460,
2... | [
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