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
Everyone must have liked the cake because there wasn’t even a _________ left.
A．crutch
B．chip
C．chop
D．clip
单项选择题
A．SinceB．AlthoughC．HoweverD．Before
A．Since
B．Although
C．However
D．Before
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