单项选择题

In order to improve our standard of living, we have to accelerate production.

A．involve
B．decrease
C．speed up
D．give up
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单项选择题
Mary looked pale and weary.
A．worried
B．ugly
C．silly
D．exhausted
单项选择题
He endured great pain before he finally expired.
A．fired
B．resigned
C．died
D．retreated
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