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<s> Chọn đáp án đúng với câu hỏi: The tables ________ at the party at the present.
A. have been laid
B. is being laid
C. is laid
D. are being laid Đáp án là: D. are being laid </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vào thời gian nào, Nguyễn Ái Quốc rời Pari đi Liên Xô, đất nước mà từ lâu Người mơ ước đặt chân tới?
A. Tháng 6-1924.
B. Tháng 6-1922.
C. Tháng 12-1923.
D. Tháng 6-1923. Đáp án là: D. Tháng 6-1923 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: and would take the ferry(35)_________
A. instead
B. however
C. rather
D. otherwise Đáp án là: B. however </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The novel is regarded as one of the classical works. I really love reading it in my free time.
A. regarded as
B. classical
C. really
D. free time. Đáp án là: B. classical </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong quá trình dao động điều hòa của con lắc đơn. Nhận định nào sau đây sai?
A. Khi quả nặng ở điểm giới hạn, lực căng dây treo có độ lớn nhỏ hơn trọng lượng của vật
B. Độ lớn của lực căng dây treo con lắc luôn lớn hơn trọng lượng vật
C. Chu kỳ dao động của con lắc không phụ thuộc vào biên độ dao động của nó
D. Khi góc hợp bởi phương dây treo còn lắc và phương thẳng đứng giảm, tốc độ của quả nặng sẽ tăng Đáp án là: B. Độ lớn của lực căng dây treo con lắc luôn lớn hơn trọng lượng vật </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây là sai Lực Lo-ren-xơ
A. Không phụ thuộc vào hướng của từ trường
B. Vuông góc với từ trường
C. Phụ thuộc vào dấu của điện tích
D. Vuông góc với vận tốc Đáp án là: A. Không phụ thuộc vào hướng của từ trường </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Từ năm 1954 – 1975, Mỹ đã lần lượt tiến hành những chiến lược chiến tranh kiểu mới nào ở Việt Nam?
A. Chiến tranh cục bộ; chiến tranh đặc biệt; Việt Nam hóa chiến tranh – Đông Dương hóa chiến tranh.
B. Chiến tranh đặc biệt; Việt Nam hóa chiến tranh – Đông Dương hóa chiến tranh; Chiến tranh cục bộ.
C. Chiến tranh đặc biệt; Chiến tranh cục bộ; Việt Nam hóa chiến tranh – Đông Dương hóa chiến tranh.
D. Việt Nam hóa chiến tranh – Đông Dương hóa chiến tranh; Chiến tranh cục bộ. Chiến tranh đặc biệt. Đáp án là: C. Chiến tranh đặc biệt; Chiến tranh cục bộ; Việt Nam hóa chiến tranh – Đông Dương hóa chiến tranh. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giới hạn quang điện của kim loại Natri là Công thoát electron của Natri là
A. 2,48eV
B. 4,48eV
C. 3,48eV
D. 1,48eV Đáp án là: A. 2,48eV </s> | [
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<s> Chọn đáp án đúng với câu hỏi: If Nam had passed the GCSE examination, he __________to take the entrance examination to the university.
A. would have been allowed
B. would have allowed
C. will have allowed
D. would allow Đáp án là: D. would allow </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để trung hòa V ml dung dịch NaOH nồng độ 1,0M cần 200 ml dung dịch H 2 SO 4 nồng độ 1,5M. Giá trị của V là
A. 600.
B. 200.
C. 900.
D. 300. Đáp án là: C. 900. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để bảo vệ rừng và tài nguyên rừng, biện pháp cần làm là:
A. Không khai thác sử dụng nguồn lợi từ rừng nữa
B. Thành lập các khu bảo tồn thiên nhiên và các vườn quốc gia
C. Tăng cường khai thác nguồn thú rừng để bảo vệ cây
D. Phá bỏ các khu rừng già để trồng lại mới. Đáp án là: B. Thành lập các khu bảo tồn thiên nhiên và các vườn quốc gia </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Loại thức uống nào dưới đây gây hại cho gan của bạn?
A. Rượu trắng
B. Nước lọc
C. Nước khoáng
D. Nước ép trái cây Đáp án là: A. Rượu trắng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thế nào là hai cụm chủ vị bao chứa nhau?
A. Hai cụm chủ vị đó phải tạo nên một câu ghép.
B. Hai cụm chủ vị mà cụm chủ vị này nằm trong cụm chủ vị kia và cụm chủ vị kia bao hàm cụm chủ vị này.
C. Hai cụm chủ vị quan hệ song song và bình đẳng với nhau trong câu.
D. Hai cụm chủ vị độc lập với nhau, không có quan hệ về mặt ngữ pháp. Đáp án là: B. Hai cụm chủ vị mà cụm chủ vị này nằm trong cụm chủ vị kia và cụm chủ vị kia bao hàm cụm chủ vị này. </s> | [
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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... |
<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 9, cho biết vùng khí hậu Tây Nguyên nằm trong miền khí hậu nào sau đây?
A. Miền khí hậu phía Bắc.
B. Miền khí hậu Nam Bộ.
C. Miền khí hậu phía Nam.
D. Miền khí hậu Nam Trung Bộ. Đáp án là: C. Miền khí hậu phía Nam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: We have given ____ time when on training.
A. few
B. a great deal of
C. a few
D. other Đáp án là: B. a great deal of </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi đổ 50 ml rượu vào 50 ml nước, ta thu được một hỗn hợp rượu - nước có thể tích bao nhiêu?
A. Dưới 100 ml.
B. Trên 100 ml.
C. Đúng bằng 50 ml.
D. Đúng bằng 100 ml. Đáp án là: A. Dưới 100 ml. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word that has the underlined part pronounced differently from the rest.
A. chest s
B. chair s
C. car s
D. table s Đáp án là: A. chest s </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Its main aim is to improve the (27)___________ and protection of whales, dolphins and porpoises in British and Irish waters.
A. conserved
B. conservation
C. conservative
D. conserve Đáp án là: B. conservation </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho tam giác ABC vuông tại C và tam giác MNO vuông tại O, có BC = NO. Cần thêm điều kiện gì để ∆ABC = ∆MNO theo trường hợp cạnh huyền – cạnh góc vuông?
A. AC = MO;
B. AB = MN;
C. AC = MN;
D. AB = MO. Đáp án là: B. AB = MN; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để tạo ra một giống cây thuần chủng có kiểu gen AAbbDD từ hai giống cây ban đầu có kiểu gen AABBdd và aabbDD, người ta có thể tiến hành: I. Lai hai giống ban đầu với nhau tạo F 1 ; cho F 1 lai trở lại với cây có kiểu gen AABBdd tạo F 2. Các cây có kiểu hình (A-bbD-) thu được ở F 2 chính là giống cây có kiểu gen AAbbDD. II. Lai hai giống ban đầu với nhau tạo F 1 ; cho F 1 tự thụ phấn tạo F 2 ; chọn các cây F 2 có kiểu hình (A-bbD-) rồi dùng phương pháp tế bào học để xác định cây có kiểu gen AAbbDD. III. Lai hai giống ban đầu với nhau tạo F 1 rồi chọn các cây có kiểu hình (A-bbD-) cho giao phấn qua một số thế hệ để tạo ra giống cây có kiểu gen AAbbDD. IV. Lai hai giống ban đầu với nhau tạo F 1 ; cho F 1 tự thụ phấn tạo F 2 ; chọn các cây F 2 có kiểu hình (A-bbD-) rồi cho tự thụ phấn qua một số thế hệ để tạo ra giống cây có kiểu gen AAbbDD. Có bao nhiêu cách tạo ra giống cây thuần chủng ở trên là đúng?
A. 1
B. 2
C. 3
D. 4 Đáp án là: A. 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tỉ trọng của các nhóm tuổi trong cơ cấu dân số ở nước ta đang chuyển biến theo hướng nào sau đây?
A. Nhóm 0 – 14 tuổi tăng, nhóm 15 – 59 tuổi giảm, nhóm 60 tuổi trở lên giảm.
B. Nhóm 0 – 14 tuổi giảm, nhóm 15 – 59 tuổi tăng, nhóm 60 tuổi trở lên tăng.
C. Nhóm 0 – 14 tuổi tăng, nhóm 15 – 59 tuổi giảm, nhóm 60 tuổi trở lên tăng.
D. Nhóm 0 – 14 tuổi giảm, nhóm 15 – 59 tuổi tăng, nhóm 60 tuổi trở lên giảm. Đáp án là: B. Nhóm 0 – 14 tuổi giảm, nhóm 15 – 59 tuổi tăng, nhóm 60 tuổi trở lên tăng. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Câu nào sau đây sai?
A. Các đồng vị phải có số khối khác nhau.
B. Các đồng vị phải có số nơtron khác nhau.
C. Các đồng vị phải có cùng điện tích hạt nhân.
D. Các đồng vị phải có số electron khác nhau. Đáp án là: D. Các đồng vị phải có số electron khác nhau </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mạch rây được cấu tạo từ những thành phần nào sau đây?
A. Các quản bào và ống rây.
B. Mạch gỗ và tế bào kèm.
C. Ống rây và mạch gỗ.
D. Ống rây và tế bào kèm. Đáp án là: D. Ống rây và tế bào kèm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho đoạn mạch điện xoay chiều AB gồm một tụ điện, một cuộn dây và một biến trở R mắc nối tiếp, điện áp xoay chiều giữa hai đầu đoạn mạch ổn định. Cho R thay đổi ta thấy: Khi Ω thì công suất tiêu thụ của biến trở có giá trị lớn nhất là P 0 ; Khi thì công suất tiêu thụ của mạch AB có giá trị lớn nhất là 2P 0. Giá trị của bằng
A. 12,4 Ω
B. 60,8 Ω
C. 45,6 Ω
D. 15,2 Ω Đáp án là: D. 15,2 Ω </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một người vay ngân hàng 90000000 đồng theo hình thức trả góp trong 3 năm. Mỗi tháng người đó phải trả số tiền bằng nhau. Giả sử lãi suất trong toàn bộ quá trình trả nợ không đổi là 0,8% trên tháng. Tổng số tiền người đó phải trả trong toàn bộ quá trình trả nợ là
A. 103320000 đồng
B. 101320000 đồng
C. 105320000 đồng
D. 103940000 đồng Đáp án là: D. 103940000 đồng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong mặt phẳng Oxy thực hiện liên tiếp phép quay tâm O góc quay −90^o và phép vị tự tâm O tỉ số -3thì điểm M(-1;1) biến thành điểm có tọa độ nào sau đây?
A. (3;-3)
B. (3;3)
C. (-3;3)
D. (-3;-3) Đáp án là: D. (-3;-3) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Linda insisted that the newly- born baby ___________after her husband’s father.
A. must be named
B. could be named
C. be named
D. ought to be named Đáp án là: C. be named </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các mối quan hệ sau, có bao nhiêu mối quan hệ mà trong đó chỉ có 1 loài có lợi? (1) Cây tỏi tiết chất gây ức chế hoạt động của vi sinh vật ở môi trường xung quanh. (2) Cây tầm gửi sống trên thân cây gỗ. (3) Cây phong lan sống bám trên cây gỗ trong rừng (4) Cây nắp ấm bắt ruồi làm thức ăn (5) Cá ép sống bám trên cá lớn.
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: Hòa tan hoàn toàn hỗn hợp gồm 13 gam kẽm và 5,6 gam sắt trong dung dịch H 2 SO 4 loãng dư thì khối lượng dung dịch sau phản ứng thay đổi như thế nào?
A. tăng 18,6 gam.
B. giảm 0,6 gam.
C. tăng 18 gam.
D. giảm 18,6 gam. Đáp án là: C. tăng 18 gam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về một hệ dao động cưỡng bức ở giai đọan ổn định, phát biểu nào dưới đây là sai?
A. Tần số của hệ dao động cưỡng bức bằng tần số của ngoại lực cưỡng bức.
B. Tần số của hệ dao động cưỡng bức luôn bằng tần số dao động riêng của hệ.
C. Biên độ của hệ dao động cưỡng bức phụ thuộc vào tần số của ngoại lực cưỡng bức.
D. Biên độ của hệ dao động cưỡng bức phụ thuộc biên độ của ngoại lực cưỡng bức. Đáp án là: B. Tần số của hệ dao động cưỡng bức luôn bằng tần số dao động riêng của hệ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo tác giả, mỗi người trong gia đình đều gắn bó và thân thuộc với cây cau như thế nào?
A. Như tri kỉ
B. Như tình bạn
C. Như tình thân
D. Như cây thuốc quý cứu giúp cả gia đình Đáp án là: C. Như tình thân </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hạt nhân càng bền vững khi có
A. số nuclon càng nhỏ
B. số nuclon càng lớn
C. năng lượng liên kết riêng càng lớn
D. năng lượng liên kết càng lớn Đáp án là: C. năng lượng liên kết riêng càng lớn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các phương trình sau, phương trình nào có nghiệm?
A. \[{\sin ^2}x + \sin x - 6 = 0\]
B. \[\cos x = \frac{\pi }{2}\]
C. \[{\cot ^2}x - \cot x + 5 = 0\]
D. \[2\cos 2x - \cos x - 3 = 0\] Đáp án là: D. \[2\cos 2x - \cos x - 3 = 0\] </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Quặng đồng ở Nhật Bản có nhiều ở các đảo
A. Kiu-xiu, Xi-cô-cư
B. Hô-cai-đô, Hôn-su
C. Hôn-su, Kiu-xiu
D. Xi-cô-cư, Hôn-su Đáp án là: D. Xi-cô-cư, Hôn-su </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một nguồn phát sóng dao động điều hòa tạo ra sóng tròn đồng tâm O truyền trên mặt nước với bước sóng. Hai điểm M và N thuộc mặt nước, nằm trên hai phương truyền sóng mà các phần tử nước đang dao động. Biết OM = 8 λ, ON = 12 λ và OM vuông góc với ON. Trên đoạn MN, số điểm mà phần tử nước dao động ngược pha với dao động của nguồn O là
A. 5
B. 4
C. 6
D. 7 Đáp án là: C. 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: She clearly joined the firm with a (an)_________to improving herself professionally.
A. view
B. aim
C. plan
D. ambition Đáp án là: A. view </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 2,81 gam hỗn hợp (MgO, ZnO, Fe 2 O 3 ) tác dụng vừa đủ với 400ml dung dịch HCl 0,1M. Khối lượng muối thu được là?
A. 3,91g.
B. 3,59g.
C. 4,27g.
D. 4,23g. Đáp án là: A. 3,91g. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hiện tượng mài mòn do sóng biển thường tạo nên các dạng địa hình nào sau đây?
A. Cột đá, vịnh biển và đầm phá.
B. Hàm ếch sóng vỗ, nền mài mòn.
C. Các cửa sông và bãi bồi ven biển.
D. Các vịnh biển có dạng hàm ếch. Đáp án là: B. Hàm ếch sóng vỗ, nền mài mòn. </s> | [
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Biết z_1 = 2 - 3i là một nghiệm của phương trình z^2 + bz + c = 0 với b, c là các số thực. Giá trị của b + c bằng
A. 9;
B. -5;
C. -1;
D. 13. Đáp án là: A. 9; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong những thập niên 50, 60 của thế kỉ XX nền công nghiệp ở Liên Xô như thế nào?
A. Bị giảm sút nghiêm trọng.
B. Là cường quốc công nghiệp đứng thứ hai trên thế giới.
C. Là cường quốc công nghiệp đứng thứ hai ở châu Âu.
D. Phát triển với tốc độ bình thường. Đáp án là: B. Là cường quốc công nghiệp đứng thứ hai trên thế giới. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo quan niệm hiện đại, ở các loài giao phối đối tượng tác động của chọn lọc tự nhiên chủ yếu là
A. Nhiễm sắc thể.
B. Cá thể.
C. Quần thể.
D. Giao tử. Đáp án là: C. Quần thể. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Người hút thuốc là nhiều thường mắc các bệnh nguy hiểm về đường hô hấp. Chất gây hại chủ yếu có trong thuốc lá là:
A. Becberin
B. Mocphin
C. Nicotin
D. Axit nicotinie Đáp án là: C. Nicotin </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hàm số y = -8x. Trong các điểm A(-1;8); B(2;-4); C((−1)/2;4);D((−1)/8;−1). Có bao nhiêu điểm thuộc đồ thị hàm số y = -8x?
A. 2
B. 1
C. 3
D. 4 Đáp án là: A. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về cạnh tranh cùng loài, có bao nhiêu phát biểu sau đây đúng? I. Cạnh tranh cùng loài làm giảm mật độ cá thể của quần thể. II. Trong cùng một quần thể, thường xuyên diễn ra cạnh tranh giữa các cá thể cùng loài. III. Cạnh tranh cùng loài là động lực thúc đẩy sự tiến hóa của các quần thể. IV. Cạnh tranh cùng loài giúp duy trì ổn định số lượng cá thể ở mức phù hợp với khả năng cung cấp nguồn sống của môi trường.
A. 4
B. 2
C. 3
D. 1 Đáp án là: C. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: You are not allowed to bring coffee into the classroom.
A. Coffee must not be brought into the classroom.
B. Coffee will not be brought into the classroom.
C. Coffee will be brought into the classroom.
D. Coffee must be brought into the classroom. Đáp án là: A. Coffee must not be brought into the classroom. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các hạt nhân H 2 1 ; triti H 1 3 ; heli H 2 4 e có năng lượng liên kết lần lượt là 2,22 MeV; 8,49 MeV và 28,16 MeV. Các hạt nhân trên được sắp xếp theo thứ tự giảm dần về độ bền vững của hạt nhân là
A.
B.
C.
D. Đáp án là: B. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dams are used to control flooding, provide water for irrigation, and generating electricity for the surrounding area.
A. to control flooding
B. irrigation
C. generating
D. surrounding area Đáp án là: C. generating </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngày 18-3-1970, diễn ra sự kiện gì làm cho Campuchia rơi vào quỹ đạo cuộc chiến tranh xâm lược thực dân kiểu mới của Mĩ?
A. Mĩ giúp LonNon lật đổ Xi-ha-nuc.
B. Mĩ mang quân xâm lược Campuchia.
C. Mĩ dựng nên chế độ độc tài Pôn-pốt ở Campuchia.
D. Mĩ hất cẳng Pháp để xâm lược Campuchia. Đáp án là: A. Mĩ giúp LonNon lật đổ Xi-ha-nuc. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khẳng định đúng là:
A. Nguyên tử có cấu tạo đặc khít, gồm hạt nhân ở trung tâm và lớp vỏ là các electron chuyển động xung quanh hạt nhân.
B. Nguyên tử có cấu tạo rỗng, gồm hạt nhân ở trung tâm và lớp vỏ là các electron chuyển động xung quanh hạt nhân.
C. Nguyên tử có cấu tạo rỗng, gồm electron ở trung tâm và hạt nhân chuyển động xung quanh.
D. Nguyên tử có cấu tạo đặc khít, gồm electron ở trung tâm và hạt nhân chuyển động xung quanh. Đáp án là: B. Nguyên tử có cấu tạo rỗng, gồm hạt nhân ở trung tâm và lớp vỏ là các electron chuyển động xung quanh hạt nhân. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Con lắc đơn dao động điều hòa có s 0 = 4 c m, tại nơi có gia tốc trọng trường g = 10 m / s 2. Biết chiều dài của dây là l = 1m. Hãy viết phương trình dao động biết lúc t = 0 vật đi qua vị trí cân bằng theo chiều dương?
A. s = 4 cos 10 πt - π 2 c m
B. s = 4 cos πt + π 2 c m
C. s = 4 cos πt - π 2 c m
D. s = 4 cos 10 πt + π 2 c m Đáp án là: C. s = 4 cos πt - π 2 c m </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kim loại nào sau đây nhẹ nhất:
A. Mg.
B. Na.
C. Li.
D. Al. Đáp án là: C. Li. </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,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Ở một loài thực vật, xét ba gen, mỗi gen có 3 alen (A, a; B, b; D,d) cùng tương tác cộng gộp quy định trọng lượng quả, cứ tăng một alen trội thuộc bất kì gen nào làm cho quả nặng thêm 5g, cây nhẹ nhất nặng 30g. Cho phép lai P: AaBbDd x AaBbdd thu được F1, quá trình giảm phân và thụ tinh bình thường, có bao nhiêu kết quả sau đây phù hợp với F1? I. Tỉ lệ cây có quả nặng 50g là 9/64. II. Có 6 kiểu gen cho trọng lượng quả nặng 40g. III. Xuất hiện cao nhất 7 kiểu hình. IV. Cây ít nhất có 3 alen lặn chiếm tỉ lệ 13/16.
A. 2
B. 4.
C. 1.
D. 3. Đáp án là: C. 1. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Năng lượng liên kết của hạt nhân đơteri là 2,2MeV và của H 2 4 e là 28,3MeV. Nếu hai hạt nhân đơteri tổng hợp thành H 2 4 e thì năng lượng tỏa ra là
A. 30,2MeV.
B. 25,8MeV.
C. 23,9MeV.
D. 19,2MeV. Đáp án là: C. 23,9MeV. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: At the end of the film, the young prince ______ in love with a reporter.
A. felt
B. made
C. fell
D. got Đáp án là: C. fell </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất nào sau khi cho vào dung dịch NaOH không tạo được chất khí?
A. Si.
B. Mg.
C. K.
D. Na. Đáp án là: B. Mg. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Hướng chùm electron quang điện có tốc độ 10 6 m / s vào một điện trường đều và một từ trường đều có cảm ứng từ 0, 5.10 − 4 T thì nó vẫn chuyển động theo một đường thẳng. Biết vecto E → song song cùng chiều với Ox, vecto B → song song cùng chiều với Oy, vecto vận tốc song song cùng chiều với Oz (Oxyz là hệ trục tọa độ đề các vuông góc). Độ lớn của vecto cường độ điện trường là:
A. 30 V/m
B. 50 V/m
C. 20 V/m
D. 40 V/m Đáp án là: B. 50 V/m </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về đột biến gen, có bao nhiêu phát biểu sau đây đúng? (1) Đột biến thay thế một cặp nuclêôtit luôn dẫn đến kết thúc sớm quá trình dịch mã. (2) Đột biến gen tạo ra các alen mới làm phong phú vốn gen của quần thể. (3) Đột biến điểm là dạng đột biến gen liên quan đến một số cặp nuclêôtit. (4) Đột biến gen có thể có lợi, có hại hoặc trung tính đối với thể đột biến. (5) Mức độ gây hại của alen đột biến phụ thuộc vào tổ hợp gen và điều kiện môi trường.
A. 1
B. 4
C. 2
D. 3 Đáp án là: D. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Quá trình chuyển hóa năng lượng trong nhà máy điện hạt nhân là
A. Năng lượng hạt nhân – Cơ năng – Điện năng.
B. Năng lượng hạt nhân – Cơ năng – Nhiệt năng – Điện năng
C. Năng lượng hạt nhân – Thế năng – Điện năng.
D. Năng lượng hạt nhân – Nhiệt năng - Cơ năng – Điện năng Đáp án là: D. Năng lượng hạt nhân – Nhiệt năng - Cơ năng – Điện năng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hỏi 1/2,1/4,1/8,1/32 là bốn số hạng đầu của dãy số nào sau đây?
A. u_n=1/(2n)
B. u_n=1/(2n+1)
C. u_n=1/(2^n)
D. u_n=1/(n^2) Đáp án là: C. u_n=1/(2^n) </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Bào quan nào sau đây có ở tế bào người?
A. Không bào co bóp.
B. Lysosome.
C. Lục lạp.
D. Không bào trung tâm. Đáp án là: B. Lysosome. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở đới lạnh có kiểu thảm thực vật chính nào sau đây?
A. Đài nguyên.
B. Thảo nguyên.
C. Hoang mạc.
D. Rừng lá kim. Đáp án là: A. Đài nguyên. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Với giá trị thực nào của a thì hệ phương trình (x+y=a^2+a+1x-y=-a^2+a-1)có nghiệm (x;y) với 3x+y nhỏ nhất?
A. a=-5/2
B. a=3/2
C. a=-3/2
D. a=0 Đáp án là: C. a=-3/2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dãy gồm các dung dịch đều tác dụng với Cu(OH) 2 là:
A. glucozo, glixerol, natri axetat
B. glucozo, glixerol, axit axetic
C. glucozo, andehit fomic, kali axetat
D. glucozo, glixerol, ancol etylic Đáp án là: B. glucozo, glixerol, axit axetic </s> | [
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Khi nói về quá trình tiêu hóa ở chim và gia cầm, có bao nhiêu phát biểu đúng trong số các phát biểu sau? I. Sự biến đổi cơ học của thức ăn không có ý nghĩa đối với quá trình tiêu hóa thức ăn. II. Ở dạ dày không có sự biến đổi hóa học thức ăn III. Quá trình tiêu hóa ở dạ dày quan trọng hơn so với ruột non. IV. Dạ dày cơ biến đổi cơ học, dạ dày tuyến có vai trò biến đổi hóa học trong quá trình tiêu hóa thức ăn
A. 2
B. 1
C. 3
D. 4 Đáp án là: B. 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các nhận định sau: 1. Mâu thuẫn về quyền lợi, thị trường và thuộc địa giữa các nước đế quốc sau Chiến tranh thế giới thứ nhất là nguyên nhân sâu xa dẫn tới Chiến tranh thế giới thứ hai. 2. Trận phản công của quân đội Liên Xô ở Xta-lin-grát đã tạo nên bước ngoặt, làm xoay chuyển tình thế của cuộc chiến tranh. 3. Chiến tranh thế giới thứ hai kết thúc đã dẫn đến những biến đổi căn bản của tình hình thế giới. 4. Giai đoạn đầu, Chiến tranh thế giới thứ hai là cuộc chiến tranh đế quốc phi nghĩa, từ khi Liên Xô tham chiến, tính chất của cuộc chiến tranh có sự thay đổi: t ính chất phi nghĩa thuộc về phe phát xít; tính chất chính nghĩa thuộc về các dân tộc đã kiên cường chống chủ nghĩa phát xít, bảo về hòa bình thế giới. Trong số các nhận định trên, có bao nhiêu nhận định chính xác?
A. 1 nhận định.
B. 2 nhận định.
C. 3 nhận định.
D. 4 nhận định. Đáp án là: D. 4 nhận định </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ống dây hình trụ không có lõi, chiều dài 50 cm, có 1000 vòng, diện tích mỗi vòng là 100 c m 2. Dòng điện qua ống dây tăng từ 0 đến 2A trong 0,1s. Độ lớn suất điện động tự cảm xuất hiện trong ống dây bằng
A. 1,256V
B. 3,14V
C. 2,51V
D. 0,502V Đáp án là: D. 0,502V </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: For more than a decade, ___________ that certain species are becoming scarce.
A. a warning for bird-watchers
B. warn the bird-watcher
C. the warnings of bird-watchers
D. bird-watchers have warned Đáp án là: D. bird-watchers have warned </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 0,08 mol hỗn hợp X gồm bốn este mạch hở phản ứng vừa đủ với 0,17 mol H 2 (xúc tác Ni, t°), thu được hỗn hợp Y. Cho toàn bộ Y phản ứng vừa đủ với 110 ml dung dịch NaOH 1M, thu được hỗn hợp Z gồm hai muối của hai axit cacboxylic no có mạch cacbon không phân nhánh và 6,88 gam hỗn hợp T gồm hai ancol no, đơn chức. Mặt khác, đốt cháy hoàn toàn 0,01 mol X cần vừa đủ 0,09 mol O 2. Phân trăm khối lượng của muối có phân tử khối lớn hơn trong Z là
A. 54,18%.
B. 50,31%.
C. 58,84%.
D. 32,88%. Đáp án là: B. 50,31%. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hợp chất hữu cơ E (mạch hở, bền ở điều kiện thường) có công thức phân tử C 2 H 4 O 2. Số đồng phân cấu tạo của E thỏa mãn là
A. 3.
B. 2.
C. 1.
D. 4. Đáp án là: A. 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phép ẩn dụ trong câu sau thuộc kiểu ẩn dụ nào? “ Người cha mái tóc bạc Đốt lửa cho anh nằm ”
A. Ẩn dụ hình thức
B. Ẩn dụ phẩm chất
C. Ẩn dụ cách thức
D. Ẩn dụ chuyển đổi cảm giác Đáp án là: B. Ẩn dụ phẩm chất </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions. Please give me a few milk and some biscuits if you have any left.
A. Please give
B. a few
C. some biscuits
D. any left Đáp án là: B. a few </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặt hiệu điện thế u = U 0 sin ω t với U 0, ω không đổi vào hai đầu đoạn mạch RLC không phân nhánh, hiệu điện thế hiệu dụng hai đầu điện trở thuần là 80V, hai đầu cuộn dây thuần cảm là 120V và hai đầu tụ điện là 60V. Hiệu điện thế hiệu dụng ở hai đầu đoạn mạch này là:
A. 140V
B. 220V
C. 100V
D. 260V Đáp án là: C. 100V </s> | [
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<s> Chọn đáp án đúng với câu hỏi: ____________ national parks all over the world have been established to protect endangered animals.
A. Thousand
B. Thousands
C. Thousands of
D. Thousand of Đáp án là: C. Thousands of </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the correct answer to complete the sentence. We ________ our bicycles to school now.
A. are riding
B. is riding
C. ride
D. rides Đáp án là: A. are riding </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tơ nào sau đây thuộc loại tơ thiên nhiên?
A. Tơ nilon-6,6.
B. Tơ nilon-6.
C. Tơ nitron.
D. Tơ tằm. Đáp án là: D. Tơ tằm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: My parents________tommorrow to stay with me for a few days.
A. came
B. have come
C. come
D. are coming Đáp án là: D. are coming </s> | [
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29873,
3011,
22396,
304,
7952,
411,
592,
363,
2... | [
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<s> Chọn đáp án đúng với câu hỏi: Tài nguyên thiên nhiên bị suy thoái là do
A. Chiến tranh, thiên tai.
B. Khai thác quá mức.
C. Phát triển nông nghiệp.
D. Dân số đông và trẻ. Đáp án là: B. Khai thác quá mức. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Gọi ζ là khoảng thời gian để số hạt nhân của một đồng vị phóng xạ giảm đi bốn lần. Sau thời gian 2 ζ số hạt nhân còn lại của đồng vị đó bằng bao nhiêu phần trăm số hạt nhân ban đầu?
A. 25,25%
B. 93,75%
C. 6,25%
D. 13,5% Đáp án là: C. 6,25% </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kết quả của nguyên phân là từ một tế bào mẹ ban đầu sau một lần nguyên phân tạo ra
A. 2 tế bào con mang NST lưỡng bội 2n
B. 2 tế bào con mang bộ NST đơn bội n
C. 4 tế bào con mang bộ NST đơn bội
D. Nhiều cơ thể đa bội Đáp án là: A. 2 tế bào con mang NST lưỡng bội 2n </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một sóng cơ ngang truyền trên một sợi dây rất dài có phương trình u = 6cos(4πt - 0, 02πx); Trong đó u và x có đơn vị là cm, t có đơn vị là giây. Hãy xác định vận tốc dao động của một điểm trên dây có toạ độ x = 25cm tại thời điểm t = 4s
A. 24π (cm/s)
B. 14π (cm/s)
C. 12π (cm/s)
D. 44π (cm/s) Đáp án là: A. 24π (cm/s) </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: The first __________ to reach the geographic South Pole was led by the Norwegian explorer Roald Amundsen.
A. expedition
B. excursion
C. voyage
D. journey Đáp án là: A. expedition </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho \[(P):\,\,y = {x^2}\] và điểm \[A(3;\,\,0),\,\,M \in (P)\]. \[AM\] đạt giá trị nhỏ nhất bằng
A. \[\sqrt 3 \].
B. \[\sqrt 5 \].
C. \[2\].
D. \[3\]. Đáp án là: B. \[\sqrt 5 \]. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Kết quả của phép toán 3 628 − 1 353 là:
A. 2 275
B. 2 265
C. 2 375
D. 2 365 Đáp án là: A. 2 275 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong mặt phẳng với hệ tọa độ Oxy, cho tam giác ABC có A(2;-1), B(4;5) và C(-3;2). Lập phương trình đường cao của tam giác ABC kẻ từ C
A. x + y - 1 = 0
B. x + 3y - 3 = 0
C. 3x + y + 11 = 0
D. 3x - y + 11 = 0 Đáp án là: B. x + 3y - 3 = 0 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong phân tử chất nào sau đây không chứa nguyên tố nitơ?
A. axit glutamic
B. amilopectin
C. anilin
D. glyxin Đáp án là: B. amilopectin </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong nguyên tử Hiđrô, khi electron chuyển động trên quỹ đạo M thì vận tốc của electron là v 1. Khi electron hấp thụ năng lượng và chuyển lên quỹ đạo P thì vận tốc của electron là v 2. Tỉ số vận tốc v 2 v 1 là
A. 4
B. 0,5
C. 2
D. 0,25 Đáp án là: B. 0,5 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sự phân bố các điểm dân cư nông thôn thường được biểu hiện bằng phương pháp
A. kí hiệu.
B. bản đồ - biểu đồ.
C. chấm điểm.
D. đường chuyển động. Đáp án là: C. chấm điểm. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Việt Nam đã vận dụng nguyên tắc nào dưới đây của Liên hợp quốc để giải quyết vấn đề Biển Đông?
A. Bình đẳng chủ quyền và quyền tự quyết của các dân tộc.
B. Không can thiệp vào công việc nội bộ của bất kì nước nào.
C. Giải quyết các tranh chấp quốc tế bằng biện pháp hòa bình.
D. Tôn trọng toàn vẹn lãnh thổ và độc lập chính trị của các nước. Đáp án là: C. Giải quyết các tranh chấp quốc tế bằng biện pháp hòa bình. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Don’t ____to any conclusions before you know the full facts.
A. turn
B. jump
C. dive
D. fly Đáp án là: B. jump </s> | [
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1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một con lắc lò xo gồm một vật nhỏ có khối 0,5 kg và lò xo có độ cứng k=80N/m Vật nhỏ được đặt trên giá đỡ cố định nằm ngnag trục lò xo. Hệ số ma sát giữa vật và giá đỡ là 0,02. Ban đầu giữa vật ở vị trí lò xo nén 5,25cm rồi buôn nhẹ để con lắc lò xo dao động tắt dần. Lấy g = 10 cm / s 2. Tìm quãng đường tổng cộng vật đi được từ lúc dao động đến khi dừng hẳn là:
A. 1,1025m
B. 2,25m
C. 1,25m
D. 2,5m Đáp án là: A. 1,1025m </s> | [
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3... | [
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1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Các chuyển động nào sau đây không phải là chuyển động cơ học?
A. Sự di chuyển của máy bay trên bầu trời
B. Sự rơi của viên bi
C. Sự chuyền của ánh sáng
D.Sự chuyền đi chuyền lại của quả bóng bàn Đáp án là: D.Sự chuyền đi chuyền lại của quả bóng bàn </s> | [
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1,
1,
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1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Đồng chí Phiđen Caxtơrô đã từng nói về Việt Nam là
A. "Vì Việt Nam, Cuba sẵn sàng hiến dâng cả máu của mình".
B. "Người Cuba đang, bước lên con đường mà người anh em Việt Nam đã vạch ra".
C. "Tên tôi là Việt Nam. Tên anh là Việt Nam, tên chúng ta là Việt Nam. Việt Nam —Hồ Chí Minh —Điện Biên Phủ".
D. "Việt Nam - lương tri của thời đại". Đáp án là: A. "Vì Việt Nam, Cuba sẵn sàng hiến dâng cả máu của mình". </s> | [
1,
1,
29871,
678,
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29876,
29871,
30128,
29976,
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274,
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29875,
29901,
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31500,
30712,
865,
18558,
30103,
1963,
29875,
30... | [
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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,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một con lắc đơn có chiều dài ι 1 đang dao động với biên độ góc α 1. Khi qua vị trí cân bằng thì dây bị vướng vào một cái đinh và tạo thành một con lắc mới có chiều dài ι 2 dao động với biên độ góc α 2. Mối quan hệ giữa α 1 và α 2 là
A. α 2 = α 1 l 1 2 + l 2 2
B. α 2 = α 1 l 1 l 2
C. α 2 = α 1 l 1 2 - l 2 2
D. α 2 = α 1 2 l 2 l 1 Đáp án là: B. α 2 = α 1 l 1 l 2 </s> | [
1,
1,
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29876,
29871,
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29976,
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378,
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207,
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29871,
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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... |
<s> Chọn đáp án đúng với câu hỏi: Cho tập hợp \({C_\mathbb{R}}A = \left[ {0;6} \right)\), \({C_\mathbb{R}}B = \left( { - \frac{{12}}{3};5} \right) \cup \left( {\sqrt {17} ;\sqrt {55} } \right).\) Tập \({C_\mathbb{R}}\left( {A \cap B} \right)\)là:
A. \[\left[ { - \frac{{12}}{3};\sqrt {55} } \right]\];
B. \[\emptyset \];
C. \[\left( { - \frac{{12}}{3};\sqrt {55} } \right)\];
D. \(\left( { - \frac{{12}}{3};0} \right) \cup \left( {\sqrt {17} ;\sqrt {55} } \right)\). Đáp án là: C. \[\left( { - \frac{{12}}{3};\sqrt {55} } \right)\]; </s> | [
1,
1,
29871,
678,
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29876,
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320,
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29907,
3187,
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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: Tìm tập hợp tất cả các giá trị của tham số m để phương trình \({4^x} - m{.2^x} + 2m - 5 = 0\) có hai nghiệm phân biệt.
A. \(\left( {0; + \infty } \right)\)
B. \(\left( {\frac{5}{2}; + \infty } \right)\)
C. \(\mathbb{R}\)
D. \(\left( {0;\frac{5}{2}} \right)\) Đáp án là: B. \(\left( {\frac{5}{2}; + \infty } \right)\) </s> | [
1,
1,
29871,
678,
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29876,
29871,
30128,
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260,
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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: Nhận định nào sau sau đây không đúng về đặc điểm phát triển ngành công nghiệp của các nước châu Á?
A. Sản xuất công nghiệp rất đa dạng ở các nước châu Á.
B. Hầu hết các nước phát triển công nghiệp sản xuất hàng tiêu dùng.
C. Sản xuất công nghiệp của các nước châu Á phát triển nhất trên thế giới.
D. Sản xuất công nghiệp không đều giữa các nước châu Á. Đáp án là: C. Sản xuất công nghiệp của các nước châu Á phát triển nhất trên thế giới. </s> | [
1,
1,
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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: According to paragraph 1, why does a clash of temperaments cause problem?
A. Because punitive or hostile parenting cannot control rebellious attitude.
B. It is difficult for the live wire to understand the quiet soul.
C. Because they are personality flaws and mental health disorders
D. Because of the lack of flexibility element in interactions. Đáp án là: D. Because of the lack of flexibility element in interactions </s> | [
1,
1,
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29871,
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29976,
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29901,
7579,
304,
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29871,
29896,
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2020,
947,
263,
1067,
1161,
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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: Tháng 12/1922 diễn ra sự kiện nào sau đây?
A. Bản Hiến pháp đầu tiên của Liên Xô được thông qua.
B. Liên bang Cộng hòa xã hội chủ nghĩa Xô viết được thành lập.
C. Nước Nga Xô viết tiến hành chính sách Cộng sản thời chiến.
D. Nước Nga Xô viết tiến hành chính sách Kinh tế mới (NEP). Đáp án là: B. Liên bang Cộng hòa xã hội chủ nghĩa Xô viết được thành lập. </s> | [
1,
1,
29871,
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30975,
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29976,
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29871,
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865,
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274,
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298,
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29875,
29901,
498,
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30103,
865,
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29896,
29906,
29914,
29896,
29929,
299... | [
1,
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... |
<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D to indicate the sentence that is CLOSEST in meaning to each of the following questions. I last saw him at my twenty-first birthday party.
A. I haven't seen him since my twenty-first birthday party.
B. I didn't see him since my twenty-first birthday party.
C. I haven't had a birthday party for twenty-one years.
D. I had twenty-once birthday parties. Đáp án là: A. I haven't seen him since my twenty-first birthday party. </s> | [
1,
1,
29871,
678,
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29876,
29871,
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29976,
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865,
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274,
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298,
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29875,
29901,
4485,
278,
5497,
319,
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350,
29892,
315,
29892,
470,
360,
304,... | [
1,
1,
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1,
1,
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1,
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1,
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1,
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1,
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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: Thổi 0,25 mol khí etilen qua 125ml dung dịch KMnO 4 1M trong môi trường trung tính (hiệu suất 100%) khối lượng etylen glicol thu được bằng
A. 11,625 gam.
B. 23,25 gam.
C. 15,5 gam.
D. 31 gam. Đáp án là: A. 11,625 gam. </s> | [
1,
1,
29871,
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30128,
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31500,
207,
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29875,
29871,
29900,
29892,
29906,
29945... | [
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1,
1,
1,
1,
1,
1... |
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