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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单项选择题
You can't smoke here; it's ______.
A．prevented
B．ceased
C．prohibited
D．stopped
单项选择题
At post offices one buys stamps, leaves ______ letters, sends parcels or money orders, etc.
A．registered
B．rejected
C．regulated
D．reflected
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