题目内容

I felt so embarrassed that I couldn't do anything but()there when I first met my present wife.

A. to sit
B. sitting
C. sat
D. sit

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Throughout most of their lives, human beings perpetually learn and increase their mental capacities().

A. actually
B. readily
C. finally
D. constantly

There()no further business to discuss, we all went home.

A. is
B. was
C. being
D. would be

We have to ask them to quit talking in order that all people present could hear us clearly().

A. decrease
B. cease
C. continue
D. keep

具有一对杂合基因的个体连续自交______代，才能使约97%的个体纯合。

A. 3
B. 5
C. 6
D. 7