A.Because they are not accustomed to it.B.Because they are not psychologically prepare

外语类 公共英语 已帮助 人

A.Because they are not accustomed to it.

B.Because they are not psychologically prepared for it.

C.Because their genes differ from those who have been tested for it.

D.Because they are less sensitive to it than those who have been tested for it.

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热搜:a是b的充分条件,b是a的必要条件吗