题目内容

受体完全激动剂的特点是

A. 亲和力高,内在活性弱
B. 亲和力低,内在活性强
C. 亲和力低,内在活性弱
D. 亲和力高,内在活性强
E. 亲和力高,无内在活性

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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

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

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