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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 the main stress in each of the following questions.
A. bedroom
B. wallet
C. resort
D. message Đáp án là: C. resort </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các hợp chất của crom có tính lưỡng tính là
A. CrO và CrO 3
B. CrO và Cr(OH) 2
C. Cr 2 O 3 và Cr(OH) 3
D. CrO 3 và K 2 Cr 2 O 7 Đáp án là: C. Cr 2 O 3 và Cr(OH) 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặc điểm nào sau đây giúp xác định chính xác về cây đa bội?
A. Tế bào có số lượng nhiễm sắc thể tăng gấp bội.
B. Các cơ quan sinh dưỡng có kích thước lớn.
C. Khả năng kết hạt kém.
D. Tế bào có cường độ trao đổi chất diễn ra mạnh mẽ. Đáp án là: A. Tế bào có số lượng nhiễm sắc thể tăng gấp bội. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong giai đoạn đầu của quá trình công nghiệp hoá, Trung Quốc ưu tiên phát triển công nghiệp nhẹ không phải do
A. đây là ngành cần ít vốn, thu hồi vốn và lợi nhuận nhanh.
B. nền kinh tế kém phát triển.
C. tận dụng nguồn nhân công dồi dào.
D. tận dụng thế mạnh về thị trường trong nước và quốc tế. Đáp án là: B. nền kinh tế kém phát triển. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Loại hình nghệ thuật nào thịnh hành ở Đàng Ngoài của Đại Việt trong các thế kỉ XVI - XVIII?
A. Hát chèo.
B. Hát tuồng.
C. Nhã nhạc cung đình.
D. Đờn ca tài tử. Đáp án là: A. Hát chèo. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Quá trình diễn thế sinh thái tại rừng lim Hữu Lũng, tỉnh Lạng Sơn diễn ra theo trinh tự như thế nào?
A. Rừng lim nguyên sinh bị chặt hết → cây bụi và cỏ chiếm ưu thế → rừng thưa cây gỗ nhỏ → cây gỗ nhỏ và cây bụi → trảng cỏ.
B. Rừng lim nguyên sinh bị chặt hết → cây gỗ nhỏ và cây bụi → rừng thưa cây gỗ nhỏ → cây bụi và cỏ chiếm ưu thế → trảng cỏ.
C. Rừng lim nguyên sinh bị chặt hết → rừng thưa cây gỗ nhỏ → cây gỗ nhỏ và cây bụi → cây bụi và cỏ chiếm ưu thế → trảng cỏ.
D. Rừng lim nguyên sinh bị chết → rừng thưa cây gỗ nhỏ → cây bụi và cỏ chiếm ưu thế → cây gỗ nhỏ và cây bụi → trảng cỏ. Đáp án là: C. Rừng lim nguyên sinh bị chặt hết → rừng thưa cây gỗ nhỏ → cây gỗ nhỏ và cây bụi → cây bụi và cỏ chiếm ưu thế → trảng cỏ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất T trong dung dịch có khả năng tác dụng với: - H 2 (xúc tác Ni, t o ), thu được chất E. - Nước brom, thu được chất G. - AgNO 3 (trong dung dịch NH 3, t o ), thu được amoni gluconat. Phát biểu nào sau đây là sai?
A. Dung dịch T hòa tan được Cu(OH) 2.
B. T được gọi là đường mía.
C. G là axit gluconic.
D. E là sobitol. Đáp án là: B. T được gọi là đường mía. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào dưới đây là sự tóm tắt đường lối kháng chiến chống thực dân Pháp (1945 - 1954) của Đảng Cộng sản Đông Dương?
A. Toàn dân, toàn diện, tự lực cánh sinh và tranh thủ các lực lượng hòa bình.
B. Toàn dân, toàn diện, trường kì, tự lực cánh sinh và tranh thủ sự ủng hộ của quốc tế.
C. Toàn dân, toàn diện, lâu dài và tranh thủ sự ủng hộ của nhân dân Pháp.
D. Toàn dân, toàn diện, trường kì và tranh thủ sự ủng hộ của các nước xã hội chủ nghĩa. Đáp án là: B. Toàn dân, toàn diện, trường kì, tự lực cánh sinh và tranh thủ sự ủng hộ của quốc tế. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mã di truyền mang tính thoái hóa, có nghĩa là
A. nhiều bộ ba khác nhau cùng mã hóa cho 1 axit amin
B. các mã bộ ba nằm nối tiếp nhau, không gối lên nhau.
C. một mã bộ ba mã hóa cho nhiều axit amin khác nhau.
D. các loài sinh vật có một bộ mã di truyền giống nhau. Đáp án là: A. nhiều bộ ba khác nhau cùng mã hóa cho 1 axit amin </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số lẻ bé nhất có tám chữ số là
A. 11 111 111
B. 10 000 001
C. 11 000 000
D. 10 000 000 Đáp án là: B. 10 000 001 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một hình chữ nhật có chu vi 300cm. Nếu tăng chiều rộng thêm 5cm và giảm chiều dài 5 cm thì diện tích tăng 275 cm^2. Tính chiều dài và chiều rộng của hình chữ nhật.
A. 120 cm và 30 cm
B. 105 cm và 45 cm
C. 70 cm và 80 cm
D. 90 cm và 60 cm Đáp án là: B. 105 cm và 45 cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhân tố quyết định đến thắng lợi của cách mạng Trung Quốc năm 1949 là
A. sự giúp đỡ của Liên Xô về vật chất, kĩ thuật.
B. sự phát triển của lực lượng cách mạng trong nước.
C. chủ nghĩa xã hội trở thành hệ thống thế giới.
D. sự suy yếu của các thế lực tư sản mại bản. Đáp án là: B. sự phát triển của lực lượng cách mạng trong nước. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Câu nghi vấn trong đoạn văn dưới đây dùng để làm gì? Cai lệ không để cho chị được nói hết câu, trợn ngược hai mắt, hắn quát: - Mày định nói cho cha mày nghe đấy à? Sưu của nhà nước mà dám mở mồm xin khất!
A. Hỏi
B. Bộc lộ tình cảm, cảm xúc
C. Đe dọa
D. Phủ định Đáp án là: C. Đe dọa </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đốt cháy hoàn toàn 1,605 gam hợp chất hữu cơ A thu được 4,62 gam CO 2 ; 1,215 gam H 2 O và 168 ml N 2 (đktc). Tỉ khối hơi của A so với không khí không vượt quá 4. Công thức phân tử của A là:
A. C 5 H 5 N.
B. C 6 H 9 N.
C. C 7 H 9 N
D. C 6 H 7 N. Đáp án là: C. C 7 H 9 N </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào không đúng về ngành dịch vụ của các nước Đông Nam Á?
A. Thông tin liên lạc được cải thiện và ngày càng nâng cấp.
B. Hệ thống giao thông được mở rộng và tăng thêm.
C. Cơ sở hạ tầng hiện đại nhất thế giới và ngày càng phát triển.
D. Hệ thống ngân hàng, tín dụng ngày càng phát triển. Đáp án là: A. Thông tin liên lạc được cải thiện và ngày càng nâng cấp. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn ý kiến chính xác nhất sau đây?
A. Một bài văn nghị luận thường có sự kết hợp sử dụng nhiều thao tác nghị luận
B. Một bài văn nghị luận thường có sự kết hợp sử dụng nhiều thao tác nghị luận, trong đó có một thao tác nghị luận chính yếu
C. Một bài văn nghị luận thường chỉ sử dụng một thao tác nghị luận nhất định
D. Một bài văn nghị luận thường chỉ sử dụng từ một đến hai thao tác nghị luận nhất định, trong đó có một thao tác đóng vai trò là thao tác nghị luận chính Đáp án là: B. Một bài văn nghị luận thường có sự kết hợp sử dụng nhiều thao tác nghị luận, trong đó có một thao tác nghị luận chính yếu </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặc điểm nào sau đây là không đúng với phần phía Đông của Liên bang Nga?
A. Phần lớn là núi và cao nguyên.
B. Nguồn khoáng sản, lâm sản lớn.
C. Có trữ năng thủy điện lớn.
D. Đồng bằng Đông Âu khá cao. Đáp án là: D. Đồng bằng Đông Âu khá cao </s> | [
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] |
<s> Chọn đáp án đúng với câu hỏi: Đun nóng hỗn hợp tất cả các ancol có công thức phân tử C 2 H 6 O, C 3 H 8 O với dung dịch H 2 SO 4 đặc ở điều kiện thích hợp, thu được hỗn hợp X chỉ gồm ete và anken. X chứa tối đa bao nhiêu hợp chất?
A. 6.
B. 3.
C. 8.
D. 5. Đáp án là: C. 8. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Biết rằng hàm số f(x)=√(x)lnx đạt giá trị lớn nhất trên đoạn [1;e] tại x=x_0. Mệnh đề nào sau đây đúng?
A. x_0∈(1;3/(e))
B. x_0∈(3/(e);√(e))
C. x_0∈(√(e);2)
D. x_0∈(2;e] Đáp án là: D. x_0∈(2;e] </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào sau đây KHÔNG thuộc đường lối cải cách – mở cửa của Trung Quốc từ năm 1978?
A. Tiến hành cải cách và mở cửa.
B. Lấy phát triển kinh tế làm trung tâm.
C. Thực hiện đường lối “ba ngọn cờ hồng”.
D. Chuyển nền kinh tế kế hoạch hóa tập trung sang nền kinh tế thị trường xã hội chủ nghĩa. Đáp án là: C. Thực hiện đường lối “ba ngọn cờ hồng”. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mục đích chính của văn bản trên là?
A. Bàn về đặc điểm tính cách của loài cừu.
B. Bàn về đặc điểm tính cách của loài chó sói.
C. Bàn về sự khác biệt giữa cái nhìn của nhà văn và nhà khoa học.
D. Bàn về đặc trưng của văn chương nghệ thuật. Đáp án là: D. Bàn về đặc trưng của văn chương nghệ thuật </s> | [
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2,
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] | [
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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,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
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,
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1,
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
] |
<s> Chọn đáp án đúng với câu hỏi: Trong quá trình dịch mã, phân tử nào sau đây đóng vai trò như "người phiên dịch"?
A. ADN.
B. tARN.
C. rARN.
D. mARN. Đáp án là: A. ADN. </s> | [
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1,
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1,
1,
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1,
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1,
1,
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1,
1,
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1,
1,
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,
1,
1,
1,
1,
1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Hai nguồn kết hợp A và B dao động theo phương vuông góc với bề mặt chất lỏng với phương trình u A = u B = 4 cos ( 40 πt ) cm, t tính bằng s. Tốc độ truyền sóng là 50 cm/s. Biên độ sóng coi như không đổi. Tại điểm M trên bề mặt chất lỏng với AM – BM = 10/3 cm, phần tử chất lỏng có tốc độ dao động cực đại bằng:
A. 120 π cm/s.
B. 100 π cm/s.
C. 80 π cm/s.
D. 160 π cm/s. Đáp án là: D. 160 π cm/s </s> | [
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1,
1,
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1,
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1,
1,
1,
1,
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1,
1,
1,
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1,
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1,
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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,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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: Mạch chọn sóng của máy thu vô tuyến điện gồm tụ C = 880pF và cuộn L = 20 μ H. Bước sóng điện từ mà mạch thu được là
A. λ = 100m
B. λ = 150m
C. λ = 250m
D. λ = 500m Đáp án là: C. λ = 250m </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,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
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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,
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1,
1,
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1,
1,
1,
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,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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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1,
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1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Cho 5,6 gam sắt tác dụng với khí clo dư, khối lượng (gam) muối thu được là
A. 32,50
B. 25,40
C. 12,70
D. 16,25 Đáp án là: D. 16,25 </s> | [
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1,
1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Trong hiện tượng khúc xạ ánh sáng, góc khúc xạ (r) là góc tạo boi
A. Tia khúc xạ và pháp tuyến tại điểm tới.
B. Tia khúc xạ và tia tới.
C. Tia khúc xạ và mặt phân cách.
D. Tia khúc xạ và điểm tới. Đáp án là: A. Tia khúc xạ và pháp tuyến tại điểm tới. </s> | [
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2,
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] | [
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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,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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: Nguyên tử X có chứa 29 electron và 35 neutron. Nguyên tử X là?
A. Copper (Cu);
B. Aluminium (Al);
C. Iron (Fe);
D. Calcium (Ca). Đáp án là: A. Copper (Cu); </s> | [
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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: Trong trường hợp nào sau đây sẽ không xảy ra hiện tượng nhiễm điện do hưởng ứng? Đặt một quả cầu mang điện tích ở gần đầu của một
A. Thanh kim loại không mang điện tích.
B. Thanh kim loại mang điện tích dương.
C. Thanh kim loại mang điện tích dương.
D. Thanh nhựa mang điện tích âm. Đáp án là: D. Thanh nhựa mang điện tích âm </s> | [
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] |
<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp X gồm SO 2 và O 2 có tỉ khối so với H 2 bằng 28. Nung nóng hỗn hợp X một thời gian (có xúc tác V 2 O 5 ) thu được hỗn hợp Y có tỉ khối so với X bằng 16/13. Hiệu suất của phản ứng tổng hợp SO 3 là
A. 60,0%
B. 50,0%.
C. 62,5%.
D. 75,0%. Đáp án là: D. 75,0% </s> | [
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<s> Chọn đáp án đúng với câu hỏi: They say the exams (25) ______ they have to take often make them worried, and they have no time to relax. Others, on the other hand, say that exams help students study better.
A. where
B. which
C. when
D. who Đáp án là: B. which </s> | [
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<s> Chọn đáp án đúng với câu hỏi: There won’t be peace in the conflict if both sides do not really desire it.
A. It is only if both sides actually want the conflict to end peacefully that it will happen.
B. As both sides in the conflict apparently desire peace, it is likely that there will be peace soon.
C. The main problem in the conflict seems to be that neither side really desires peace.
D. There has been a lot of fighting in the conflict because both sides seem to want it that way. Đáp án là: A. It is only if both sides actually want the conflict to end peacefully that it will happen. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: We are a very close-knit family and very _________ of each other.
A. confident
B. supportive
C. reserved
D. obedient Đáp án là: A. confident </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Do you mind ___ the shopping with me?
A. to do
B. do
C. doing
D. did Đáp án là: C. doing </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các bất đẳng thức sau, bất đẳng thức nào là bất đẳng thức tam giác?
A. AB - BC > AC
B. AB + BC > AC
C. AB + AC = BC
D. BC > AB Đáp án là: B. AB + BC > AC </s> | [
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1,
1,
1,
1,
1,
1,
1,
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<s> Chọn đáp án đúng với câu hỏi: Đảng Cộng sản Việt Nam ra đời năm 1930 là kết quả tất yếu của
A. Phong trào dân tộc dân chủ trong những năm 1919 - 1926.
B. Cuộc đấu tranh dân tộc và giai cấp ở Việt Nam trong thời đại mới.
C. Phong trào công nhân trong những năm 1925 - 1927.
D. Phong trào công nhân trong những năm 1919 - 1925. Đáp án là: B. Cuộc đấu tranh dân tộc và giai cấp ở Việt Nam trong thời đại mới. </s> | [
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1,
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1,
1,
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] |
<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D to indicate the word CLOSEST in meaning to the underlined word. The organization was established in 1950 in the USA.
A. put on
B. taken over
C. brought out
D. set up Đáp án là: D. set up </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cuối năm 1974 đầu 1975, ta mở đọt hoạt động quân sự Đông - Xuân, trọng tâm là đâu?
A. Đồng bằng Nam Bộ
B. Đồng bằng sông Cửu Long và Đông Nam Bộ
C. Trung Bộ và Khu V
D. Mặt trận Trị - Thiên Đáp án là: B. Đồng bằng sông Cửu Long và Đông Nam Bộ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sóng cơ truyền từ môi trường có mật độ vật chất lớn qua môi trường có mật độ vật chất bé (như từ nước ra không khí) thì
A. Tốc độ truyền tăng
B. bước sóng giảm
C. tần số tăng.
D. chu kỳ tăng Đáp án là: B. bước sóng giảm </s> | [
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1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Thiết bị nào sau đây bay quanh Trái Đất và phát tín hiệu có thông tin xuống Trái Đất?
A. Vệ tinh nhân tạo.
B. Các loại ngôi sao.
C. Vệ tinh tự nhiên.
D. Trạm hàng không. Đáp án là: A. Vệ tinh nhân tạo. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The passage mentions all of the following colors for icebergs EXCEPT
A. yellow
B. blue
C. green
D. purple Đáp án là: A. yellow </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vật chuyển động thẳng nhanh dần đều từ trạng thái đứng yên và đi được đoạn đường S trong thời gian 4 s. Xác định thời gian vật đi được 3 4 đoạn đường cuối.
A. 1 s.
B. 2 s.
C. 3 s.
D. 4 s. Đáp án là: B. 2 s. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho thí nghiệm như hình vẽ, bên trong bình có chứa khí NH 3, trong chậu thủy tinh chứa nước có nhỏ vài giọt phenolphthalein. Hiện tượng xảy ra trong thí nghiệm là
A. Nước phun vào bình và chuyển thành màu xanh.
B. Nước phun vào bình và không có màu.
C. Nước phun vào bình và chuyển thành màu tím.
D. Nước phun vào bình và chuyển thành màu hồng. Đáp án là: D. Nước phun vào bình và chuyển thành màu hồng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngày 8 - 8 - 1918, liên quân nào với 400 xe tăng đã đập tan phòng tuyến sông Xen, tiêu diệt 16 sư đoàn quân Đức?
A. Liên quân Pháp - Mĩ
B. Liên quân Anh - Pháp
C. Liên quân Pháp - Nga
D. Liên quân Bồ Đào Nha - Pháp Đáp án là: B. Liên quân Anh - Pháp </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 question.
A. current
B. toxic
C. remain
D. forest Đáp án là: C. remain </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các ankan không tan trong dung môi nào dưới đây?
A. nước
B. tetraclometan (CCl 4 )
C. n- hexan
D. đietyl ete(C 2 H 5 -O-C 2 H 5 ) Đáp án là: A. nước </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trường hợp nào sau đây áp suất khí quyển lớn nhất
A. Tại đỉnh núi
B. Tại chân núi
C. Tại đáy hầm mỏ
D. Trên bãi biển Đáp án là: C. Tại đáy hầm mỏ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Những thao tác chính của văn nghị luận là gì?
A. Giải thích
B. Phân tích, chứng minh
C. Bình luận, bác bỏ
D. Tất cả các đáp án trên Đáp án là: D. Tất cả các đáp án trên </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,
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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: Cho các chất sau: CH 3 COOCH 3 (1), CH 2 =CHCOOCH 3 (2), C 6 H 5 COOCH=CH 2 (3), CH 2 =CHOOC-C 2 H 5 (4), HCOOC 6 H 5 (5), CH 2 =CHCOOCH 2 C 6 H 5 (6). Chất nào khi tác dụng với NaOH đun nóng thu được ancol?
A. (1), (3), (5), (6).
B. (1), (2), (5), (6).
C. (2), (4), (5), (6).
D. (1), (2), (6). Đáp án là: D. (1), (2), (6) </s> | [
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2,
2
] | [
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1,
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1,
1,
1,
1,
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1,
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1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Khoảng cách giữa hai đường thẳng d: 7x + y – 3 = 0 và ∆: (x=−2+ty=2−7t) là:
A. (3√(2))/2;
B. 15
C. 9
D. 9/(√(50)). Đáp án là: A. (3√(2))/2; </s> | [
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1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Rừng A-ma-dôn tập trung chủ yếu ở các quốc gia nào sau đây?
A. Bra-xin và Cô-lôm-bi-a.
B. Ac-hen-ti-na và Bô-li-vi-a.
C. Bra-xin và Pa-ra-goay.
D. E-cua-do và U-ru-goay. Đáp án là: A. Bra-xin và Cô-lôm-bi-a. </s> | [
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] |
<s> Chọn đáp án đúng với câu hỏi: You can listen to what you want when you want, and you won't ever (34)________anything.
A. pass
B. lack
C. miss
D. lose Đáp án là: C. miss </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cách nhận biết rõ rệt nhất thời điểm cần bón phân là căn cứ vào dấu hiệu bên ngoài của
A. quả non.
B. thân cây.
C. hoa.
D. lá cây. Đáp án là: D. lá cây </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dân số trên thế giới tăng lên hay giảm đi là do
A. xuất cư và tử vong.
B. sinh đẻ và xuất cư.
C. sinh đẻ và nhập cư.
D. sinh đẻ và tử vong. Đáp án là: D. sinh đẻ và tử vong </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các mệnh đề sau, mệnh đề nào sai?
A. Nếu đường thẳng a song song với mặt phẳng (P) và đường thẳng b vuông góc với a thì b vuông góc với mặt phẳng (P);
B. Nếu đường thẳng a song song với đường thẳng b và b song song với mặt phẳng (P) thì a song song hoặc nằm trên mặt phẳng (P);
C. Nếu đường thẳng a song song với mặt phẳng (P) và đường thẳng b vuông góc với mặt phẳng (P) thì a vuông góc với b;
D. Một đường thẳng vuông góc với hai đường thẳng cắt nhau trong một mặt phẳng thì nó vuông góc với mặt phẳng đó. Đáp án là: A. Nếu đường thẳng a song song với mặt phẳng (P) và đường thẳng b vuông góc với a thì b vuông góc với mặt phẳng (P); </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the best answer. We ________to get up early when we were young.
A. didn’t used
B. did used
C. don’t use
D. didn’t use Đáp án là: D. didn’t use </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kim loại được rèn, kéo sợi, dát mỏng tạo nên các đồ vật khác nhau nhờ tính chất nào sau đây?
A. Tính dẫn nhiệt
B. Tính dẻo
C. Có ánh kim
D. Tính dẫn điện Đáp án là: B. Tính dẻo </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thực hiện các thí nghiệm sau: (1) Cho dung dịch AgNO 3 vào dung dịch HCl dư. (2) Cho Al 2 O 3 vào dung dịch HCl loãng dư. (3) Cho Cu vào dung dịch HNO 3 loãng dư. (4) C ho dung dịch NaOH vào dung dịch Ca(HCO 3 ) 2. Sau khi kết thúc phản ứng, số trường hợp thu được chất rắn là:
A. 4.
B. 3.
C. 2.
D. 1. Đáp án là: C. 2. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Động vật nào sau đây là động vật ưa sáng?
A. Thằn lằn
B. Muỗi
C. Dơi
D. Cả A, B và C đều đúng Đáp án là: A. Thằn lằn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đường lối kháng chiến chống Pháp của Đảng và Chính phủ nước Việt Nam Dân chủ Cộng hòa được thể hiện qua nhiều văn kiện, ngoại trừ
A. “Quân lệnh số một” của Ủy ban khởi nghĩa toàn quốc.
B. “Lời kêu gọi toàn quốc kháng chiến” của Chủ tịch Hồ Chí Minh.
C. chỉ thị “Toàn dân kháng chiến” của Ban Thường vụ Trung ương Đảng.
D. tác phẩm “Kháng chiến nhất định thắng lợi” của Tổng Bí thư Trường Chinh. Đáp án là: A. “Quân lệnh số một” của Ủy ban khởi nghĩa toàn quốc. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hàm số y=ax^2(a≠0). Điểm M(1;2)thuộc đồ thị hàm số khi
A. a=2
B. a=1/2
C. a=−2
D. a=1/4 Đáp án là: A. a=2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: She wasn’t wearing a seat-belt. She was injured.
A. If she hadn’t been wearing a seat-belt, she wouldn’t have been injured.
B. If she had been wearing a seat-belt, she would have been injured.
C. If she had been wearing a seat-belt, she wouldn’t be injured.
D. If she had been wearing a seat-belt, she wouldn’t have been injured. Đáp án là: D. If she had been wearing a seat-belt, she wouldn’t have been injured </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ứng động khác với hướng động ở đặc điểm nào?
A. Có nhiều tác nhân kích thích
B. Tác nhân kích thích không định hướng
C. Có sự vận động vô hướng
D. Không liên quan đến sự phân chia tế bào Đáp án là: B. Tác nhân kích thích không định hướng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tiến hành phản ứng nhiệt nhôm hoàn toàn m gam hỗn hợp X gồm bột Al và Fe x O y trong điều kiện không có không khí thu được hỗn hợp Y. Nghiền nhỏ, trộn đều hỗn hợp Y rồi chia thành 2 phần: - Phần 1 có khối lượng 14,49 gam được hòa tan hết trong dung dịch HNO 3 loãng, dư, đun nóng thu được dung dịch Z và 0,165 mol NO (sản phẩm khử duy nhất). - Phần 2 đem tác dụng với dung dịch NaOH dư đun nóng thu được 0,015 mol khí H 2 và còn lại 2,52 gam chất rắn. Công thức của oxit sắt và giá trị của m lần lượt là
A. Fe 3 O 4 và 28,98
B. Fe 2 O 3 và 28,98
C. Fe 3 O 4 và 19,32
D. FeO và 19,32 Đáp án là: C. Fe 3 O 4 và 19,32 </s> | [
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1,
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1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: O Henry là nhà văn nước nào?
A. Đan Mạch
B. Mỹ
C. Tây Ban Nha
D. Bồ Đào Nha Đáp án là: B. Mỹ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Có 8 dung dịch chứa: NaNO 3, Mg(NO 3 ) 2, Fe(NO 3 ) 2, Cu(NO 3 ) 2, Na 2 SO 4, MgSO 4, FeSO 4, CuSO 4. Hãy nêu 2 thuốc thử cần để nhận biết 8 dung dịch trên
A. NaOH, NaCl
B. HCl, NaCl
C. NaOH, BaCl 2
D. HCl, NaOH Đáp án là: C. NaOH, BaCl 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dung dịch muối nào sau đây tác dụng được với cả Ni và Pb?
A. Pb(NO 3 ) 2
B. Cu(NO 3 ) 2
C. Fe(NO 3 ) 2
D. Ni(NO 3 ) 2 Đáp án là: B. Cu(NO 3 ) 2 </s> | [
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1,
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1,
1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Cho hình chóp tứ giác đều S.ABCD, đáy ABCD là hình vuông có cạnh 3cm, cạnh bên SB = 5cm. Tính bình phương đường cao SH của hình chóp
A. 41/2
B. 41
C. 82/3
D. 22 Đáp án là: A. 41/2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các kết quả sau, kết quả nào đúng?
A.Nếu limu_n=a và limv_n=±∞ thì lim(v_n)/(u_n)=0
B.Nếu limu_n=a, limv_n=0 và v_n>0 với mọi n thì lim(u_n)/(v_n)=+∞
C. Nếu u_n≥0với mọi n và limu_n=a thì a≥0 và lim√(u_n)=√(a)
D. Nếu limu_n=+∞ và limv_n=a thì limu_nv_n=+∞ Đáp án là: C. Nếu u_n≥0với mọi n và limu_n=a thì a≥0 và lim√(u_n)=√(a) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: My brother is interested in playing _______ guitar.
A. Ø
B. an
C. a
D. the Đáp án là: D. the </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Rather than disturbing the meeting, I left without saying goodbye.
A. I would rather disturb the meeting than leave without saying goodbye.
B. I left without saying goodbye as I didn’t want to disturb the meeting.
C. I disturb the meeting because I said goodbye.
D. The meeting was disturbed as I left saying goodbye. Đáp án là: B. I left without saying goodbye as I didn’t want to disturb the meeting. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Now teachers are making continuous efforts to make the classroom a good place to learn and succeed. They are aiming towards making the education attractive and sensible.
A. Now teachers who are aiming towards making the education attractive and sensible are making continuous efforts to make the classroom a good place to learn and succeed.
B. Making continuous efforts to make the classroom a good place to learn and succeed, teachers are now aiming towards making the education attractive and sensible.
C. As now teachers are making continuous efforts to make the classroom a good place to learn and succeed, they are aiming towards making the education attractive and sensible.
D. Now teachers are making continuous efforts to make the classroom a good place to learn and succeed so that they are aiming towards making the education attractive and sensible. Đáp án là: A. Now teachers who are aiming towards making the education attractive and sensible are making continuous efforts to make the classroom a good place to learn and succeed. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về NaOH và Na 2 CO 3, kết luận nào sau đây không đúng?
A. Cùng làm mềm nước cứng vĩnh cửu.
B. Cùng làm quỳ tím hóa xanh.
C. Cùng phản ứng với dung dịch HCl.
D. Cùng phản ứng với dung dịch Ba HCO 3 2. Đáp án là: A. Cùng làm mềm nước cứng vĩnh cửu. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào sau đây không phải là của phương pháp phân tích các thế hệ lai?
A. Đem lai các cặp bố mẹ không thuần chủng khác nhau về một số tính trạng
B. T heo dõi sự di truyền riêng rẽ từng cặp tính trạng ở các thế hệ sau
C. Chọn các cặp bố mẹ thuần chủng khác nhau về một số tính trạng và đem lai với nhau.
D. Dùng toán thống kê phân tích các số liệu, từ đó rút ra các định luật di truyền Đáp án là: A. Đem lai các cặp bố mẹ không thuần chủng khác nhau về một số tính trạng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the best answer. Marry ____________(wait) in the lobby, wasn’t she?
A. was waited
B. waited
C. was waiting
D. wasn’t waiting Đáp án là: C. was waiting </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một lò xo có độ cứng 125N/m, chiều dài tự nhiên 40cm, một đầu giữ cố định ở A, đầu kia gắn vào quả cầu khối lượng 10g có thể trượt không ma sát trên thanh nằm ngang. Thanh quay đều quanh trục ( ∆ ) thẳng đứng với tốc độ 360 vòng/phút. Lấy π 2 = 10. Độ dãn của lò xo gần nhất với giá trị nào sau đây?
A. 5,3cm
B. 5,0cm
C. 5,1cm
D. 5,5cm Đáp án là: C. 5,1cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngay sau đại thắng mùa Xuân 1975, tổ chức bộ máy nhà nước ở Việt Nam có đặc điểm gì?
A. Đất nước bị chia cắt thành hai miền với hai chế độ chính trị.
B. Đất nước đã được thống nhất hoàn toàn về mặt nhà nước.
C. Tổ Quốc Việt Nam chưa được thống nhất về mặt lãnh thổ.
D. Mỗi miền vẫn tồn tại hình thức tổ chức nhà nước khác nhau. Đáp án là: D. Mỗi miền vẫn tồn tại hình thức tổ chức nhà nước khác nhau </s> | [
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] |
<s> Chọn đáp án đúng với câu hỏi: 1.3 giờ 15 phút – 2 giờ 12 phút =...
A.1 giờ 25 phút
B.1 giờ 3 phút
C.5 giờ 27 phút
D.5 giờ 3 phút. Đáp án là: B.1 giờ 3 phút </s> | [
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1,
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1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Liên kết Maxơ – Rainơ hình thành ở biên giới ba nước:
A. Đức, Bỉ, Hà Lan
B. Đức, Pháp, Hà Lan
C. Hà Lan, Đức, Luc-xăm-bua
D. Anh, Pháp, Hà Lan Đáp án là: A. Đức, Bỉ, Hà Lan </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đến giữa thế kỉ XIX, ở miền Nam nước Mĩ phát triển kinh tế đồn điền dựa trên cơ sở nào?
A. Sự bóc lột sức lao động của nô lệ
B. Sự bóc lột công nhân làm thuê
C. Sự bóc lột nông dân
D. Sự bóc lột các tầng lóp nhân dân lao động Đáp án là: A. Sự bóc lột sức lao động của nô lệ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các chất sau: eten, axetilen, benzen, toluen, axetanđehit, phenol, axit acrylic, vinylaxetilen, isopren. Có bao nhiêu hiđrocacbon có thể làm mất màu dung dịch brom?
A. 7
B. 5
C. 4
D. 6 Đáp án là: C. 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhỏ từ từ đến dư dung dịch NaOH loãng vào mỗi dung dịch sau: FeCl 3, CuCl 2, AlCl 3, FeSO 4, BaCl 2. Sau khi các phản ứng xảy ra hoàn toàn, số trường hợp thu được kết tủa là :
A. 5
B. 3.
C. 2
D. 4. Đáp án là: B. 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho tập A gồm 6 phần tử. Số tập con (khác rỗng) của A là
A. 2^6
B. C62
C. 2^6+1
D. 2^6-1 Đáp án là: D. 2^6-1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho A = (x+4)/5.(x+1)/(2x).(100x)/(x^2+5x+4). Chọn câu đúng
A. A = 100
B. A = 12
C. A = 10
D. A = 1 Đáp án là: C. A = 10 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thứ tự thực hiện phép tính đối với biểu thức không chứa dấu ngoặc là:
A. Lũy thừa → cộng, trừ → nhân, chia
B. Lũy thừa → nhân, chia → cộng, trừ
C. Nhân, chia → cộng, trừ → lũy thừa
D. Cộng, trừ → lũy thừa → nhân, chia. Đáp án là: B. Lũy thừa → nhân, chia → cộng, trừ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một ống dây dài 50cm có 2500 vòng dây. Đường kính của ống bằng 2cm. Cho một dòng điện biến đổi đều theo thời gian chạy qua ống dây. Sau thời gian 0,01s dòng điện tăng từ 0 đến 1,5A. Suất điện động tự cảm trong ống dây có độ lớn:
A. 1,48V
B. 0,49V
C. 0,75V
D. 0,05V Đáp án là: C. 0,75V </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Với điều kiện nào của x thì biểu thức B =(2x−4)/(3−x) nhận giá trị không âm?
A. 2 ≤ x < 3
B. (x≥2x<3)
C. 2 ≤ x ≤ 3
D. 2 < x < 3 Đáp án là: A. 2 ≤ x < 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn câu trả lời đúng. Trong bảng tuần hoàn các nguyên tố hoá học, vị trí của nguyên tố Fe là
A. Số thứ tự 26, chu kỳ 4, nhóm VIIB, sắt là nguyên tố kim loại nhóm B.
B. Số thứ tự 26, chu kỳ 4, nhóm VIB, sắt là nguyên tố phi kim.
C. Số thứ tự 26, chu kỳ 4, nhóm VIIIB, sắt là nguyên tố kim loại nhóm B.
D. Số thứ tự 26, chu kỳ 4, nhóm VB, sắt là kim loại nhóm B. Đáp án là: C. Số thứ tự 26, chu kỳ 4, nhóm VIIIB, sắt là nguyên tố kim loại nhóm B. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thành phần chính của quặng photphorit là
A. C a 3 ( P O 4 ) 2
B. N H 4 H 2 P O 4
C. C a ( H 2 P O 4 ) 2
D. C a H P O 4 Đáp án là: A. C a 3 ( P O 4 ) 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: An-đéc-xen là nhà văn của nước nào?
A. Đan Mạch.
B. Thuỵ Sĩ.
C. Pháp.
D. Thuỵ Điển. Đáp án là: A. Đan Mạch. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số liên kết đôi và liên kết đơn trong phân tử etilen lần lượt là
A. 1 và 2.
B. 2 và 1.
C. 1 và 4.
D. 2 và 4. Đáp án là: C. 1 và 4. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Maryam and Lan are pen pals, they ________ two times a week.
A. correspond
B. write letter
C. meet
D. phone each other Đáp án là: A. correspond </s> | [
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] |
<s> Chọn đáp án đúng với câu hỏi: Having been served dinner,...........................
A. the problem was discussed by the members of the committee.
B. the committee members discussed the problem.
C. it was discussed by the committee members the problem.
D. a discussion of the problem was made by the members of the committee. Đáp án là: B. the committee members discussed the problem. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điểm nào sau đây thuộc đồ thị hàm số \[y = \frac{{2x - 1}}{{x\left( {3x - 4} \right)}}\]?
A. M(0; 1);
B. \(N\left( {2; - \frac{3}{4}} \right)\);
C. \(P\left( {\frac{4}{3};0} \right)\);
D. \(Q\left( { - 2; - \frac{1}{4}} \right)\). Đáp án là: D. \(Q\left( { - 2; - \frac{1}{4}} \right)\) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Muốn pha loãng dung dịch axit H 2 SO 4 đặc cần làm như sau:
A. Rót từ từ dung dịch axit đặc vào nước
B. Rót từ từ nước vào dung dịch axit đặc
C. Rót nhanh dung dịch axit đặc vào nước
D. Rót thật nhanh nước vào dung dịch axit đặc Đáp án là: A. Rót từ từ dung dịch axit đặc vào nước </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Miền Tây Bắc và Bắc Trung Bộ là nơi có
A. đầy đủ ba đai khí hậu ở địa hình miền núi
B. đồng bằng châu thổ mở rộng về phía biển
C. địa hình đồi núi thấp chiếm ưu thế
D. hướng núi và thung lũng nổi bật là vòng cung Đáp án là: A. đầy đủ ba đai khí hậu ở địa hình miền núi </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Not until Columbs discovered America___________ to Europe.
A. was bananas brought
B. bananas were brought
C. were bananas brought
D. bananas was brought Đáp án là: C. were bananas brought </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Read the following passage and then choose the best answer. It is commonly believed that school is where people go to get an education. Nevertheless, it has been said that today children interrupt their education to go to school. The difference between schooling and education implied by this remark is important. Education is much more open-ended and all-inclusive than schooling. Education knows no limits. It can take place anywhere, whether in the shower or on the job, whether in the kitchen or on a tractor. It includes both the formal learning that takes place in school and the whole universe of informal learning. The agent (doer) of education can vary from respected grandparents to the people arguing about politics on the radio, from a child to a famous scientist. Whereas schooling has a certain predictability, education quite often produces surprises. A chance conversation with a stranger may lead a person to discover how little is known of other religions. People receive education from infancy on. Education, then, is a very broad, inclusive term. It is a lifelong process, a process that starts long before the start of school, and one that should be an integral part of one's entire life. Schooling, on the other hand, is a specific, formalized process, whose general pattern varies little from one setting to the next. Throughout a country, children arrive at school at approximately the same time, take assigned seats, are taught by an adult, use similar textbooks, do homework, take exams, and so on. The slices of reality that are to be learned, whether they are the alphabet or an understanding of the workings of government, have usually been limited by the boundaries of the subject being taught. For example, high school students know that they are not likely to find out in their classes the truth about political problems in their communities or what the newest filmmakers are experimenting with. There are definite conditions surrounding the formalized process of schooling. What does the writer mean by saying "education quite often produces surprises"?
A. Educators often produce surprises.
B. Informal learning often brings about unexpected result
C. Success of informal learning is predictable.
D. It's surprising that we know little about other religions Đáp án là: B. Informal learning often brings about unexpected result </s> | [
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1,
1
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất:Các số 0; 2; 4; 6; 8; 10;... 20;... 30;... được gọi là:
A. Các số tự nhiên
B. Số tự nhiên
C. Dãy số
D. Dãy số lẻ Đáp án là: A. Các số tự nhiên </s> | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Thay dấu * để được số nguyên tố 3* ̄:
A. 7
B. 4
C. 6
D. 9 Đáp án là: A. 7 </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
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1,
1,
1,
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,
1,
1,
1,
1,
1,
1,
1,
1,
1
] |
<s> Chọn đáp án đúng với câu hỏi: Một tế bào lưỡng bội bình thường nguyên phân, số NST trong tế bào ở kỳ giữa là bao nhiêu?
A. n NST đơn
B. n NST kép
C. 2n NST đơn
D. 2n NST kép Đáp án là: D. 2n NST kép </s> | [
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