题目内容

Nothing taking place there is interesting, ______

A. are they
B. is it
C. didn't they
D. isn't it

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I forgot ______ something which I have long meant to ask you.

A. to ask
B. having asked
C. to be asking
D. to have asked

需求大于供给时的价格（）。

A. 在均衡价格之上
B. 在均衡价格之下
C. 将导致需求曲线的移

It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).

A. shall be
B. be
C. are to be
D. must be

The vitamins necessary for a healthy body are normally supplied by a ______ of fruit and green vegetables.

A. variety
B. fraction
C. section
D. series