单项选择题

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

A．endeavor
B．expedition
C．trail
D．chase
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单项选择题
It is always useful to have savings to ______.
A．come out in
B．live up to
C．make a fuss of
D．fall back on
单项选择题
The groom's hand ______ the soft mane of the horse.
A．struck
B．provoked
C．fondled
D．remarked
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