单项选择题

Many old people in the cities find themselves unable to get used to the rapid ______ of city life.

A) rate
B) speed
C) step
D) pace
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单项选择题
It is ______ of him to leave the classroom just because the others didn't agree with him.
A) childish
B) childlike
C) pretty
D) natural
单项选择题
Peter is one of the few persons I know who ______ learnt from experience.
A) has
B) was
C) had
D) have
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