题目内容

半缩醛对碱、氧化剂、还原剂稳定，可分离出来。（）

A. 对
B. 错

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无论酸还是碱催化下的酮的α－H的卤代反应，烯醇化一步都是决带步骤。（）

A. 对
B. 错

when is Mid-Autumn Festival ?

A. the 15th day of the 8th lumar month
B. August 15th in the calendar
C. full moon day

Paul and Sue decided to go to a restaurant. They reserved a table. But the restaurant was almost empty. So they ________________ a table.

A. mustn't reserve
B. needn't reserve
C. couldn't have reserved
D. needn't have reserved

A: I got very wet walking home in the rain last night. B: Why did you walk? You ___________ a taxi.

A. could take
B. can take
C. could have taken
D. must have taken