单项选择题

Generally speaking, all kinds of materials will expand when heated but will ______ when cooled.

A．contrast
B．contract
C．survive
D．return
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We have only a few hours so we must ______ our time.
A．grasp
B．take
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单项选择题
The rest of his life is ______ to the cause of international exchange of visiting scholars.
A．added
B．put
C．saved
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