单项选择题

Metals ______ when cooled and expand when heated.

A. decrease
B. reduce
C. condense
D. contract
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单项选择题
The doctor took X-rays to （） the chance of broken bones．

A．make sure
B．rule out
C．break down
D．knock out
单项选择题
He has behaved in the most extraordinary way recendy; I can’t （） his behaving like that at all．

A．look into
B．break through
C．account for
D．get over
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