单项选择题

In his ______ to further his knowledge of the universe, man has now begun to explore space.

A．attempt
B．expedition
C．trial
D．chase
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单项选择题
We only help to ______ it right when he begins to suffer the results of being ill-prepared for life's test and difficulties.
A．correct
B．rectify
C．reclaim
D．pat
单项选择题
Nowhere but in the continuous research work ____ find the meaning of his life.
A．for him to
B．he can
C．he could
D．can he
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