单项选择题

You can't smoke here; it's ______.

A．prevented
B．ceased
C．prohibited
D．stopped
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单项选择题
The sick person has taken a ______ for the better.
A．cover
B．recover
C．change
D．turn
单项选择题
It is useless to attempt to ______ from every danger: some risks must be taken.
A．flee
B．hide
C．hesitate
D．run
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