单项选择题

It is impossible for parents to shield their children from every danger.

A．protect
B．relieve
C．conserve
D．free
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单项选择题
Space is full of unseen hazards among which are cosmic rays.
A．dangers
B．ventures
C．galaxies
D．prospects
单项选择题
The politician tried to convince the voters that he was the man for the job.
A．preach
B．persuade
C．confront
D．specify
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