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单项选择题

It is postulated that population trends have an effect on economic fluctuations.

A. challenged
B. assumed
C. accepted
D. doubted
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单项选择题They are endeavoring to change society as a whole.

A. trying
B. working
C. doing
D. making

单项选择题With immense relief, I stopped running.

A. much
B. enormous
C. little
D. extensive