单项选择题

The sick person has taken a ______ for the better.

A．cover
B．recover
C．change
D．turn
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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
单项选择题
The travel industry plays a major role in the ______ of business, recreation, and family life.
A．sphere
B．scales
C．surplus
D．surveys
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