单项选择题

Space is full of unseen hazards among which are cosmic rays.

A．dangers
B．ventures
C．galaxies
D．prospects
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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
单项选择题
The each revolves both round the sun and on its own axis.
A．resolves
B．involves
C．evolves
D．rotates
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