Các ankin có đồng phân vị trí khi số cacbon trong phân tử lớn hơn hoặc bằng  

A. 2

B. 3.

C. 4

D. 5.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. missed

C. stopped

D. closed

Mark the letter A, B, c, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions

Question 44. Antarctic blue whales can be 100 foot long and weigh more than any dinosaur that ever lived

                                                             A             B                                       C           D

A.can be

B.100 foot long

C.more than

D.any dinosaur

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

The office phoned me. Then I knew more about the meeting.

A. I don’t know more about the meeting as soon as the office phoned me. 

B. I knew more about the meeting before the office phoned me. 

C. Not until the office phoned me I knew more about the meeting. 

D. Not until the office phoned me did I know more about the meeting.

Dùng bình thủy tinh có thể chứa được tất cả các dd axit trong dãy nào sau đây

A. H₂SO₄, HF, HNO₃

B. HCl, H₂SO₄, HNO₃

C. HCl, H₂SO₄, HF

D. HCl, H₂SO₄, HF, HNO₃

Cho 9,6 gam hỗn hợp X gồm Mg và Fe₃O₄ vào 300 ml dung dịch HNO₃ 2M thu được dung dịch Y và 0,896 lít (đktc) hỗn hợp N₂O và NO có tỉ khối so với hidro là 16,75. Trung hòa Y cần dùng 40 ml NaOH 1M thu được dung dịch A, cô cạn A thu được m gam muối khan. Biết rằng phản ứng xảy ra hoàn toàn và khi cô cạn muối không bị nhiệt phân. Giá trị của m là

A. 42,26

B. 19,76

C. 28,46

D. 72,45

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

My mother regretted not having planted a garden this year. She felt bad when buying vegetables at the supermarket.

A. If my mother had planted a garden this year, she wouldn’t have had to buy her vegetables from the supermarket. 

B. When she realized that the vegetables at the supermarket were so bad, my mother decided to grow her own from then on. 

C. Feeling sorry that she hadn’t planted a garden this year, my mother did not feel good about purchasing vegetables from the supermarket.

D. The garden that my mother had not planted, which she regretted not doing, would have produced better vegetables than the ones she got at the supermarket.

cho tam giác ABC cân tại A . kẻ AH \(\perp\)BC . lấy M \(\in\)BH . so sánh AH , AM và AC