单项选择题

In a ______ to further his knowledge of the unknown, man has begun to explore the outer space.

A．quest
B．denial
C．notion
D．insight
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单项选择题
He had had a(n) ______ opportunity to get himself out of difficulty before he made that fatal mistake.
A．feeble
B．audible
C．ample
D．interim
单项选择题
The boys ______ their father because, although he was stern, he was fair.
A．looked down upon
B．looked up to
C．looked up at
D．looked up for
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