单项选择题

Because of a recent obstacle in production, sales have dropped and accordingly profits have ______ .

A．declined
B．increased
C．broken
D．maintained
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单项选择题
It is our ______ policy that we will achieve unity through peaceful means.
A．consistent
B．considerate
C．certain,
D．decisive
单项选择题
Man may destroy the balance of nature, but from time to time, nature takes a terrible ______ .
A．attack
B．threat
C．lesson
D．revenge
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