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<s> Chọn đáp án đúng với câu hỏi: The author implies that the advertising industry requires______.
A. millions of dollars
B. a college-educated work force
C. innovative thinking
D. government regulation Đáp án là: C. innovative thinking </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Người ta kiểm tra chi tiết máy bằng thép nhờ một máy dò lỗ hổng dùng siêu âm, vận tốc truyền siêu âm là 2500m/s. Tín hiệu đầu tiên phản xạ sau 8 μ s ( 8 μ s = 8.10 − 6 s ) kể từ lúc phát tín hiệu, còn tín hiệu thứ 2 sau 20 μ s tí... | [
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<s> Chọn đáp án đúng với câu hỏi: I am sure he did not know that his brother graduated with flying colors.
A. He should not have been envious of his brother's achievement.
B. He cannot have known that his brother graduated with very high marks.
C. That his brother graduated with flying colors must have been appreciated... | [
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<s> Chọn đáp án đúng với câu hỏi: Kim loại sắt tác dụng với dung dịch nào sau đây tạo ra muối sắt(II)?
A. HNO 3 đặc, nóng, dư.
B. CuSO 4.
C. H 2 SO 4 đặc, nóng, dư.
D. MgSO 4. Đáp án là: B. CuSO 4. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn đáp án đúng nhất:
A. Muốn tính diện tích xung quanh của hình lập phương ta lấy diện tích một mặt nhân với 4
B. Muốn tính diện tích toàn phần của hình lập phương ta lấy diện tích một mặt nhân với 6
C. Cả A và B đều sai
D. Cả A và B đều đúng Đáp án là: D. Cả A và B đều đúng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các chất dưới đây được sinh ra trong tế bào sống? (1) Saccaraza (2) proteaza (3) nucleaza (4) lipit (5) amilaza (6) saccarozo (7) protein (8) axit nucleic (9) lipaza (10) pepsin Những chất nào trong các chất trên là enzim?
A. (1), (2), (3), (4), (5)
B. (1), (6)... | [
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<s> Chọn đáp án đúng với câu hỏi: Propilen có số nguyên tử cacbon trong phân tử là
A. 2.
B. 4.
C. 3.
D. 6. Đáp án là: C. 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho dd Ba(OH) 2 đến dư vào 10 ml dd X chứa các ion: NH 4 +, SO 4 2–, NO 3 – thì có 2,33 gam kết tủa tạo thành và đun nóng thì có 0,672 lít (đktc) một khí bay ra. Nồng độ mol c ủa (NH 4 ) 2 SO 4 và NH 4 NO 3 đã hòa tan trong 10 ml X là
A. 1,0 M và 1,0 M... | [
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<s> Chọn đáp án đúng với câu hỏi: Phần trắc nghiệm Nội dung câu hỏi 1 Giai đoạn tiến hoá hoá học từ các chất vô cơ đã hình thành các chất hữu cơ đơn giản rồi phức tạp là nhờ:
A. Sự xuất hiện của cơ chế tự sao chép
B. Tác động của các enzim và nhiệt độ
C. ... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các số dưới đây số nào vừa chia hết cho 2, vừa chia hết cho 3
A. 542
B. 554
C. 552
D. 544 Đáp án là: C. 552 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tại sao phong trào đấu tranh giành độc lập ở châu Phi lại được mở đầu từ khu vực Bắc Phi
A. Khu vực này có trình độ phát triển hơn các khu vực khác.
B. Chủ nghĩa thực dân ở đây yếu hơn nơi khác
C. Do tinh thần yêu nước ở khu... | [
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<s> Chọn đáp án đúng với câu hỏi: “Would you like to have lunch with me today?” said Tom.
A. Tom suggested me to have dinner with him that day.
B. Tom suggested to have dinner with him that day.
C. Tom invited me to have dinner with him that day.
D. Tom invited me having dinner with him that day. Đáp án là: C. Tom invi... | [
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<s> Chọn đáp án đúng với câu hỏi: Một đoạn mạch gồm R, L, C nối tiếp, cuộn dây thuần cảm. Đặt vào hai đầu đoạn mạch một điện áp xoay chiều u = U 0 cos2 π ft V với f thay đổi được. Khi f = f 1 = 49 Hz và f = f 2 = 64 Hz thì công suất tiêu thụ của mạch là như nhau P 1 = P 2... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất sau: axit acrylic, foman đehit, phenyl fomat,glucozơ, anđêhit axetic, metyl axetat, saccarozơ. Số chất có thể tham gia phản ứng tráng bạc là.
A. 5.
B. 4.
C. 6.
D. 3. Đáp án là: B. 4. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Peter said: “I will try to learn hard to pass the entrance exam.”
A. Peter said that he would try to learn hard to pass the entrance exam.
B. Peter told that he would try to learn hard to pass the entrance exam.
C. Peter asked that he would try to learn hard to pass the entrance exam.
... | [
1,
1,
29871,
678,
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29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
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30030,
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325,
31280,
29875,
274,
30057,
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29901,
5310,
1497,
29901,
1346,
29902,
674,
1018,
304,
5110,
2898,
304,
12... | [
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<s> Chọn đáp án đúng với câu hỏi: We ______ forget our passport when we travel abroad.
A. needn’t
B. mustn’t
C. don’t have to
D. couldn’t Đáp án là: B. mustn’t </s> | [
1,
1,
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29901,
1334,
903,
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29918,
9566,
1749,
1209,
637,
746,
591,
9850,
2817... | [
1,
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1,
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<s> Chọn đáp án đúng với câu hỏi: 5840g =... Kg? Số thích hợp điền vào chỗ chấm là:
A. 58,4kg
B. 5,84kg
C. 0,584kg
D. 0,0584kg Đáp án là: B. 5,84kg </s> | [
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1,
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29946,
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353,
856,
476,
29887,
29973... | [
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<s> Chọn đáp án đúng với câu hỏi: Áp dụng quy tắc Maccopnhicop vào trường hợp nào sau đây?
A. Phản ứng cộng của Br 2 với anken đối xứng.
B. Phản ứng trùng hợp của anken
C. Phản ứng cộng của HX vào anken đối xứng.
D. Phản ứng cộng của HX vào anken bất đối xứng Đáp á... | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
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865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
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29875,
29901,
319,
30103,
29886,
868,
31214,
865,
439,
29891,
11062,
207,
137,
30... | [
1,
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1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Rearrange the sentences to make meaningful sentences Question: present/ Ba/ doing/ at/ exercises/ is/ morning.
A. Ba morning exercises is doing at present.
B. Ba is doing present at morning exercises.
C. Ba is doing morning present at exercises.
D. Ba is doing morning exercises at pres... | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
390,
799,
3881,
278,
25260,
304,
1207,
6593,
1319,
25260,
894,
2990... | [
1,
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Một đồng phân của C 6 H 14 có công thức công cấu tạo như sau: Bậc của nguyên tử cacbon số 2 trong mạch chính là
A. bậc IV
B. bậc III
C. bậc I
D. bậc II Đáp án là: A. bậc IV </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
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865,
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4546,
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29877,
31500,
30712,
865,
13... | [
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1,
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<s> Chọn đáp án đúng với câu hỏi: Trong tổng diện tích đất nông nghiệp của Đồng bằng sông Hồng, đất phù sa màu mỡ chiếm (%)
A. 50.
B. 60.
C. 70.
D. 80. Đáp án là: C. 70. </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
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1605,
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207,
140,
865,
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195... | [
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<s> Chọn đáp án đúng với câu hỏi: I hope to pass all of my courses this term. So far my grades ______ pretty good.
A. had been
B. will have been
C. have been
D. were Đáp án là: C. have been </s> | [
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1,
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29901,
306,
4966,
304,
1209,
599,
310,
590,
21888,
445,
1840,
29889,
1105,... | [
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1,
1,
1,
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<s> Chọn đáp án đúng với câu hỏi: Cho mạch điện như hình vẽ. Trong đó bộ nguồn có a pin mắc nối tiếp, mỗi pin có suất điện động 1,5V và điện trở trong 0,5Ω. Mạch ngoài gồm các điện trở R 1 = 20 Ω, R 2 = 9 Ω, R 3 = 2 Ω, đèn Đ loại 3V – 3W, R p là bình điện phân đựng dung... | [
1,
1,
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678,
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29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
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865,
325,
31280,
29875,
274,
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298,
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29875,
29901,
14542,
611,
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305,
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30128,
347,
31214,
31500,
29876,
302,
... | [
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Phép cộng các số tự nhiên có những tính chất nào dưới đây?
A. Tính chất giao hoán
B. Tính chất kết hợp
C. Tính chất cộng với số 0
D. Tất cả các đáp án trên đều đúng Đáp án là: D. Tất cả các đáp án trên đều đúng </s> | [
1,
1,
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1963,
6430,
274,
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865,
274,
25968,
269,
30984,
260,
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30... | [
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1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho các chất Al, AlCl 3, Zn(OH) 2, NH 4 HCO 3, KHSO 4, NaHSO 4, NaHS, Fe(NO 3 ) 2. Số chất vừa phản ứng với dung dịch NaOH vừa phản ứng với dung dịch HCl là:
A. 5
B. 4
C. 3
D. 6 Đáp án là: A. 5 </s> | [
1,
1,
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838,
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83... | [
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một cây bút giá 3500 đồng. Nếu mỗi học sinh mua 2 cây như thế thì 10 em mua hết bao nhiêu tiền?
A. 70000 đồng
B. 35000 đồng
C. 7000 đồng
D. 3500 đồng Đáp án là: A. 70000 đồng </s> | [
1,
1,
29871,
678,
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29876,
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30128,
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29871,
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14384,
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29871,... | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Số liên kết cộng hóa trị giữa các nuclêôtit bị phá vỡ sau 1 lần nhân đôi của một gen có N nuclêôtit là:
A. N.
B. N-2.
C. (N-2) ×( 2 k - 1)
D. 0 Đáp án là: D. 0 </s> | [
1,
1,
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30975,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Hai xạ thủ bắn mỗi người một viên đạn vào bia, biết xác suất bắn trúng vòng 10 của xạ thủ thứ nhất là 0,75 và của xạ thủ thứ hai là 0,85. Tính xác suất để có ít nhất một viên trúng vòng 10?
A. 0,9625
B. 0,325
C. 0, 6375
D. 0,0375 Đáp án là: A. 0,9625 </s> | [
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1,
1,
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<s> Chọn đáp án đúng với câu hỏi: Kết quả rút gọn biểu thức K=((√(a))/(√(a)−1)−1/(a−√(a))):(1/(√(a)+1)+2/(a−1))(a>0a≠1) có dạng (m.a+n)/(√(a)). Tính giá trị của 2m+3n
A.2m+3n=4
B.2m+3n=−1
C.2m+3n=−4
D.2m+3n=1 Đáp án là: B.2m+3n=−1 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: In the process of drying certain kinds of fruits, sulphur fumes helps ________.
A. crack the skin
B. kill of bacteria
C. remove the wax coating
D. maintain the color Đáp án là: D. maintain the color </s> | [
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<s> Chọn đáp án đúng với câu hỏi: It is often necessary for riders to change buses when traveling to their ( 24 ) ___________.
A. purpose
B. objective
C. destination
D. beginning Đáp án là: C. destination </s> | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Nếu x = ( log_82)log_2^8 thì log_3x bằng:
A. -3
B. -1/3
C. 1/3
D. 3 Đáp án là: A. -3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đoạn trích "Vượt thác" tập trung miêu tả nhân vật nào?
A. Dượng Hương Thư và chú Hai
B. Dượng Hương Thư
C. Cảnh hai bên sông Thu Bồn
D. Dòng sông Thu Bồn Đáp án là: B. Dượng Hương Thư </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Ở bán cầu Bắc từ ngày 23/9 đến ngày 21/3 hiện tượng ngày và đêm diễn ra thế nào?
A. Ngày ngắn hơn đêm.
B. Ngày và đêm khác nhau.
C. Ngày dài hơn đêm.
D. Ngày và đêm bằng nhau. Đáp án là: A. Ngày ngắn hơn đêm. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Question 5
A. left
B. over
C. staying
D. survive Đáp án là: A. left </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Choose the option A, B, C, or D that best fits the sentence The tasks were not academically ______ enough for me, so I got bored.
A. troublesome
B. challenging
C. easy
D. problematic Đáp án là: B. challenging </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho mạch điện như hình bên.Biết ξ = 9 V ; r = 1 Ω ; R 1 = 5 Ω và R 2 = 20 Ω ; R 3 = 30 Ω. Bỏ qua điện trở của dây nối.Hiệu điện thế giữa hai đầu R 1 là
A. 8,5V
B. 6,0V
C. 4,5V
D. 2,5V Đáp án là: D. 2,5V </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ví dụ nào sau đây là cơ quan tương đồng?
A. Gai của cây xương rồng và tua cuốn ở cây đậu Hà Lan.
B. Cánh của sâu bọ và cánh của các loài chim,
C. Mang của cá chép và mang của tôm sú
D. Gai của cây hoa hồng và gai của cây xương rồng. Đ... | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Kim loại X là kim loại cứng nhất, được sử dụng để mạ các dụng cụ kim loại, chế tạo các loại thép chống gỉ, không gỉ...Kim loại X là?
A. Fe.
B. Ag.
C. Cr.
D. W. Đáp án là: C. Cr. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The widely used natural fiber of all is cotton.
A. The widely used
B. fiber
C. is
D. cotton Đáp án là: A. The widely used </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một dòng điện có cường độ 2mA chạy qua một dây dẫn có điện trở 3kΩ. Công suất tỏa nhiệt trên dây có độ lớn là
A. 6W
B. 6000W
C. 0,012W
D. 18W Đáp án là: C. 0,012W </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Thực hiện các thí nghiệm sau ở điều kiện thường (1) Cho bột nhôm vào bình đựng brom lỏng. (2) Sục khí H 2 S vào dung dịch FeSO 4. (3) Cho dung dịch Mg(NO 3 ) 2 vào dung dịch chứa FeSO 4 và H 2 SO 4 loãng. (4) Cho Cr 2 O 3 vào dung dịch NaOH loãng,... | [
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<s> Chọn đáp án đúng với câu hỏi: Trường hợp nào sau đây không phải là cách li sau hợp tử?
A. Con lai không phát triển đến tuổi trưởng thành sinh dục.
B. Những cá thể của các loài có họ hàng gần gũi mặc dù ở cùng khu nhưng sống trong những sinh cảnh khác nhau nên ... | [
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<s> Chọn đáp án đúng với câu hỏi: Tại sao Giang lại nói dối bố khi giới thiệu nhân vật “tôi”?
A. Muốn tạo cho bố một bất ngờ.
B. Khiến cả ba nhân vật sẽ không rơi vào tình huống khó xử.
C. Muốn nhân vật “tôi” tự nói với bố Giang sau.
D. Đáp án khác. Đáp án là: B... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các sơ đồ phản ứng sau: 1 C u O + H 2 S O 4 d a c, n o n g → 2 S + H 2 S O 4 d a c, n o n g → 3 F e S + H C l → 4 F e O + H 2 S O 4 → Số phản ứng tạo ra chất khí là:
A. 1
B. 2
C. 3
D. 4 Đáp án là: B. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giá trị của chữ số 8 trong số 45873246 là:
A. 8000
B. 80000
C. 800000
D. 8000000 Đáp án là: C. 800000 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vật được ném theo phương ngang với tốc độ v 0 =10m/s từ độ cao h so với mặt đất. Chọn hệ trục toạ độ Oxy sao cho gốc O trùng với vị trí ném, Ox theo chi ề u vận tốc đ ầu, Oy h ướ ng thẳng đ ứ ng xuống dưới, gốc thời g... | [
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<s> Chọn đáp án đúng với câu hỏi: Mr. Brown told the schoolgirls_______ in class.
A. don't ear
B. not to eat
C. eat not
D. not eat Đáp án là: B. not to eat </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The company has decided to withdraw from some _________ of its.
A. sponsor
B. sponsored
C. sponsorship
D. sponsoring Đáp án là: C. sponsorship </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Từ bài học sụp đổ của chế độ xã hội chủ nghĩa ở Liên Xô và các nước Đông Âu, cần rút ra bài học gì trong công cuộc xây dựng chủ nghĩa xã hội ở Việt Nam?
A. Duy trì, củng cố và nâng cao vai trò lãnh đạo của Đảng Cộng sản.
B.... | [
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<s> Chọn đáp án đúng với câu hỏi: Có thể dùng kính lúp để quan sát vật nào dưới đây?
A. Một ngôi sao
B. Một con vi trùng
C. Một con kiến
D. Một cái cây to Đáp án là: C. Một con kiến </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Di truyền y học tư vấn có nhiệm vụ
A. Chẩn đoán, cung cấp thông tin về khả năng mắc các loại bệnh di truyền ở đời con của các gia đình đã có bệnh này, từ đó ngăn cấm việc kết hôn, sinh đẻ ở thế hệ sau
B. C hẩn đoán, cung cấ... | [
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<s> Chọn đáp án đúng với câu hỏi: In some Asian countries, it is customary for people to worship their ancestors.
A. fossils
B. elders
C. forefathers
D. heirs Đáp án là: A. fossils </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho cấp số nhân lùi vô hạn có u_1=1 và công bội q=1/3. Tổng của cấp số nhân lùi vô hạn đã cho bằng
A. 3.
B. 2/3
C. 3/2
D. 2. Đáp án là: C. 3/2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhúng cuộn sợi len và cuộn dây bông vào nước, rồi treo chúng lên dây phơi.Sau vài phút, hầu như toàn bộ nước bị tụ lại ở phần dưới cuat cuộn sợi len còn ở cuộn sợi bông thì nước lại được phân bố gần như đồng đều tro... | [
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207,
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1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Các ngành kinh tế nào sau đây là sản phẩm của nền kinh tế tri thức:
A. Công nghiệp khai thác mỏ kim loại, luyện kim và cơ khí.
B. Các ngành công nghiệp có hàm lượng kĩ thuật cao.
C. Công nghiệp chế biến nông lâm thủy sản, sản xuất ... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Vật thực hiện đồng thời hai dao động cùng phương cùng tần số theo phương trình x = 4 sin ( πt + α ) cm và x 2 = 4 3 cosπ t cm. Biên độ dao động tổng hợp đạt giá trị lớn nhất khi
A. α = π / 2
B. α = 0
C. α = - π / 2
D. α = π Đáp án là: A. α = π / ... | [
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<s> Chọn đáp án đúng với câu hỏi: Khí Etilen được sản sinh trong hầu hết các thành phần khác nhau của cơ thể thực vật. Tốc độ hình thành êtilen phụ thuộc vào loại mô và giai đoạn phát triển của cơ thể. Vai trò của êtilen là:
A. Điều khiển đóng mở khí khổng
B. Th... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Quá trình hình thành quần thể thích nghi diễn ra nhanh hay chậm không phụ thuộc vào yếu tố nào dưới đây
A. Áp lực của CLTN
B. Quá trình phát sinh và tích lũy các gen đột biến ở mỗi loài
C. Tốc độ sinh sản của loài
D. Nguồn dinh du... | [
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<s> Chọn đáp án đúng với câu hỏi: Kết quả hoạt động buổi đầu của Việt Nam Quang phục hội là
A. t uyên truyền vận động được quần chúng nhân dân ở trong nước
B. m ở được nhiều lớp huấn luyện cán bộ tại Quảng Châu
C. k huấy động được dư luận trong và ngoà... | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về bằng chứng giải phẫu học so sánh, phát biểu nào sau đây sai?
A. Cơ quan tương đồng là những cơ quan có cùng kiểu cấu tạo.
B. Cơ quan tương đồng là những cơ quan có cùng nguồn gốc.
C. Cơ quan tương đồng là những cơ quan... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho N (Z = 7). Cấu hình electron của Nitơ là?
A. 1s 2 2s 2 2p 4.
B. 1s 2 2s 2 2p 6.
C. 1s 2 2s 2 2p 3.
D. 1s 2 2s 2 2p 5. Đáp án là: C. 1s 2 2s 2 2p 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hình vẽ nào sau đây xác định sai chiều của dòng điện cảm ứng:
A. Hình A.
B. Hình B.
C. Hình C.
D. Hình D. Đáp án là: A. Hình </s> | [
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<s> Chọn đáp án đúng với câu hỏi: I don’t think it is fair to _____________ a comparison between the two sisters
A. do
B. draw
C. take
D. strike Đáp án là: B. draw </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Truyện bánh chưng bánh giầy cho ta biết tục lệ gì của cư dân Văn Lang?
A. Ăn nhiều đồ nếp.
B. Tục thờ cúng tổ tiên.
C. Cư dân Văn Lang không thích ăn đồ nếp.
D. Nhiều trò chơi được tổ chức. Đáp án là: B. Tục thờ cúng tổ tiên. <... | [
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<s> Chọn đáp án đúng với câu hỏi: Một chất hữu cơ X có công thức đơn giản là C 4 H 4 O tác dụng vừa dung dịch KOH nồng độ 11,666%. Sau phản ứng thu được dung dịch Y. Cô cạn dung dịch Y thì phần hơi chỉ có H 2 O với khối lượng 86,6 gam, còn lại là chất rắn Z có khố... | [
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<s> Chọn đáp án đúng với câu hỏi: Nguyên liệu để điều chế khí oxi trong phòng thí nghiệm là:
A. H 2 O;
B. KClO 3 ;
C. HCl;
D. H 2 SO 4. Đáp án là: B. KClO 3 ; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Loại sụn nào dưới đây có vai trò đậy kín đường hô hấp khi nuốt thức ăn?
A. Sụn nhẫn
B. Sụn giáp
C. Sụn thanh nhiệt
D. Tất cả các phương án còn lại đều đúng Đáp án là: C. Sụn thanh nhiệt </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nguồn than khai thác ở Trung du miền núi phía Bắc được dùng chủ yếu vào mục đích
A. nhiệt điện và xuất khẩu.
B. nhiệt điện và công nghiệp hoá chất.
C. xuất khẩu và công nghiệp hoá chất.
D. nhiệt điện và luyện kim. Đáp án là: A.... | [
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<s> Chọn đáp án đúng với câu hỏi: Bọ xít có vòi chích dịch cây mướp để sinh sống. Bọ xít và cây mướp thuộc mối quan hệ
A. hợp tác.
B. kí sinh – vật chủ.
C. hội sinh.
D. cộng sinh. Đáp án là: B. kí sinh – vật chủ. </s> | [
1,
1,
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29876,
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29976,
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1952,
31214,
921,
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1302,
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992,
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29875... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Giá trị nhỏ nhất của hàm số \(y = {x^3} + 3{x^2} - 9x + 1\)trên đoạn \(\left[ { - 4;4} \right]\) là
A. \( - 4\).
B. \(4\).
C. \(1\).
D. \( - 1\). Đáp án là: A. \( - 4\). </s> | [
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: 13. Teenagers enjoy......to music and.............. out with friends.
A. listen – hang
B. to listen- to hang
C. listening – hang
D. listening – hanging Đáp án là: D. listening – hanging </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Kết quả của phép tính |117| + |-33| là:
A. 150
B. 84
C. 149
D. 50 Đáp án là: A. 150 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Khẩu hiệu nổi tiếng của Tuyên ngôn Nhân quyền và Dân quyền ở nước Pháp là
A. Đề cao quyền tự do của con người.
B. Đề cao tư tưởng của các nhà triết học ánh sáng.
C. Bảo vệ quyền lợi cho giai cấp tư sản.
D.Tự do - Bình đẳn... | [
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6... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Một este có công thức phân tử C 3 H 6 O 2 là có phản ứng tráng gương với dung dịch A g N O 3 trong N H 3. Công thức cấu tạo của este đó là công thức nào?
A. HCOOC 2 H 5
B. CH 3 COOCH 3
C. HCOOC 3 H 7
D. C 2 H 5 COOCH 3 Đáp án là: A. HCOOC 2 H 5 </s> | [
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho các chất sau: (1) CH 2 =CHCH 2 OH ; (2) OHCCH 2 CHO; (3) HCOOCH=CH 2; (4) C2H2. Phát biểu đúng là
A. 1, 2, 3 tác dụng được với Na.
B. Trong (1), (2), (3), (4) có 2 chất cho phản ứng tráng gương.
C. 1, 2, là các đồng phân.
D. 1, 2, 3 cháy đều cho số... | [
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1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: What is she doing? - She __________ to music
A. listen
B. listens
C. is listening
D. listening Đáp án là: C. is listening </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 with given words The second/ priority/ train/ young people/ job application skills.
A. The second priority is training young people for job application skills.
B. The second priority is to train young people for job application s... | [
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29901,
14542,
852,
278,
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319,
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350,
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315,
470,
360,
304,
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1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Đến năm 1960, miền Bắc có 172 xí nghiệp do Nhà nước quản lí, hơn 500 xí nghiệp công nghiệp địa phương quản lí. Đó là kết quả của:
A. Bước đầu phát triển kinh tế
B. Khôi phục kinh tế.
C. Cải tạo xã hội chủ nghĩa
D. Tất cả cùng ... | [
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<s> Chọn đáp án đúng với câu hỏi: He didn't notice anything. We might have been in trouble otherwise.
A. If he noticed anything, we would be in trouble.
B. If he hadn't noticed anything, we couldn't have been in trouble.
C. If he had noticed anything, we could have been in trouble.
D. If he noticed anything, we could h... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Thành tựu nào sau đây là của công nghệ gen?
A. Tạo giống dâu tằm có lá to
B. Tạo giống cừu sản xuất prôtêin người.
C. Tạo cừu Đôli
D. Tạo giống lợn có ưu thế lai ca o. Đáp án là: B. Tạo giống cừu sản xuất prôtêin người. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Bán kính đường tròn nội tiếp tam giác có ba cạnh lần lượt là 5, 12, 13 là:
A. √(2)
B. √(3)
C. 2
D. 2√(2) Đáp án là: C. 2 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Một vật có khối lượng 50 kg chuyển động nhanh dần đều với vận tốc ban đầu 0,2 m/s và khi đi được quãng đường 50 cm vận tốc đạt được 0,9 m/s thì lực tác dụng.
A. 38,5 N.
B. 38 N.
C. 24,5 N.
D. 34,5 N. Đáp án là: A. 38,5 N. </s> | [
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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 phản ứng oxi hóa khử sau: 3I 2 + 3H 2 O ® HIO 3 + 5HI (1) 2HgO ® 2Hg + O 2 h (2) 4K 2 SO 3 ® 3K 2 SO 4 + K 2 S (3) NH 4 NO 3 ® NO 2 h + 2H 2 O (4) 2KClO 3 ® 2KCl + 3O 2 h (5) 3NO 2 + 2H 2 O ® 2HNO 3 + NO h (6) 4HClO 4 ® 2Cl 2 + 7O 2 h + 2H 2 O (7) 2H 2 O 2 ® 2H 2 O + O 2... | [
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Trong văn bản trên, tác giả đã chỉ ra điều gì là nguyên nhân cơ bản nhất khiến cho việc dùng bao bì ni lông có thể gây nguy hại với môi trường tự nhiên?
A. Tính không phân hủy của pla – xtic
B. Trong ni lông màu có nhiều chất độc hại... | [
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1,
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1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Điều kiện để xảy ra lũ quét ở những lưu vực sông suối miền núi là địa hình
A. không bị chia căt, độ dốc nhỏ, có lớp phủ thực vật, bề mặt đất dễ bị rửa trôi.
B. bị chia cắt mạnh, độ dốc lớn, mất lớp phủ thực vật, be... | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Chăn nuôi gia súc nhỏ của Trung du và miền núi Bắc Bộ phát triển chủ yếu dựa vào
A. sản phẩm phụ của chế biến thuỷ sản.
B. sự phong phú của thức ăn trong rừng.
C. nguồn lúa gạo và phụ phẩm của nó.
D. sự phong phú của hoa màu lưo... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Natri, kali và canxi được sản xuất trong công nghiệp bằng phương pháp
A. Thuỷ luyện
B. Nhiệt luyện
C. Điện phân nóng chảy
D. Điện phân dung dịch Đáp án là: C. Điện phân nóng chảy </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word whose underlined part is pronounced differently from that of the other words.
A. h old
B. h our
C. h appy
D. h usband Đáp án là: B. h our </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Đặt điện áp u = U 0 cosωt (U 0 không đổi, ω thay đổi được) vào hai đầu đoạn mạch gồm điện trở R, cuộn cảm thuần có độ tự cảm L và tụ điện có điện dung C mắc nối tiếp. Hiện tượng cộng hưởng điện xảy ra khi
A.
B. ω 2 LCR – 1 = ... | [
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<s> Chọn đáp án đúng với câu hỏi: Trong không gian Oxyz cho ba điểm A(2;0;0), B(0;−3;0) và C(0;0;5). Hãy viết phương trình mặt phẳng (ABC).
A. (x)/5+(y)/(−3)+(z)/2=1.
B. (x)/(−3)+(y)/2+(z)/5=1.
C. (x)/2+(y)/5+(z)/(−3)=1.
D. (x)/2+(y)/(−3)+(z)/5=1. Đáp án là: D. (x)/2+(y)/(−3)+(z)/5=1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Success in this industry depends a lot ____ luck!
A. with
B. from
C. at
D. on Đáp án là: D. on </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Trong hộp có 1 quả bóng xanh, 1 quả bóng đó, 1 quả bóng vàng. Khi lấy một quả bóng từ trong chiếc hộp thì có mấy khả năng xảy ra:
A. 0
B. 1
C. 2
D. 3 Đáp án là: D. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hai góc phụ nhau α và β. Tính giá trị của biểu thức P = sinα.cosβ + sinβ.cosα.
A. 0
B. 1
C. -1
D. 2 Đáp án là: B. 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tìm x trong biểu thức (−10).x=20?
A. -1
B. 2
C. 13
D. -13 Đáp án là: B. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho (√(2)-1)^m<(√(2)-1)^n. Khi đó:
A. m=n
B. m<n
C. m>n
D. m≠n Đáp án là: C. m>n </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số 0,(5) được biểu diễn dưới dạng phân số tối giản là
A. 1/2
B. 1/5
C. 5/9
D. 1/9 Đáp án là: C. 5/9 </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... |
<s> Chọn đáp án đúng với câu hỏi: Để loại bỏ các khí HCl, Cl 2, CO 2 và SO 2 cólẫntrong khíN 2 người ta sử dụng lượng dư dung dịch
A. AgNO 3
B. Ca(OH) 2
C. H 2 SO 4
D. CuCl 2 Đáp án là: B. Ca(OH) 2 </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
29871,
30250,
29872,
31500,
207,
140,
658,
29874,
31214,
29875,
1045,... | [
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,
1,
1,
1,
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: Mrs. Smith and her students are visiting the zoo. Mike. "Can I feed the gorilla, Mrs. Smith?" Mrs. Smith. "______”.The sign says 'No feeding the animals'."
A. Of course you can
B. I don't think it works
C. I'm sure about that
D. I'm afraid not Đáp án là: D. I'm afraid not </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
6285,
29889,
7075,
322,
902,
8041,
526,
6493,
292,
278,
22424,
2988... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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: Châu Nam Cực được tiến hành nghiên cứu một cách toàn diện vào năm?
A. 1955.
B. 1958.
C. 1956.
D. 1957. Đáp án là: D. 1957 </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
16579,
31500,
29884,
13041,
10406,
207,
158,
31214,
29883,
29871,
301... | [
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,
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1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
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