Chất C₄H₈O có mấy đồng phân là anđehit mạch hở?

A. 3                       

B. 2                        

C. 1                       

 D. 4

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSET in meaning to the underlined word(s) in each of the following question.

Some of the rude drivers, on the road today are the ones who will not allow other cars to merge into traffic.

A. blend

B. concentrate

C. secede

D. desensitize