单项选择题

Scientists say that many factors () changes in the weather.

A. bring in
B. bring off
C. bring about
D. bring forward

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单项选择题
It is () for a person in his position to make such a mistake.

A. rare
B. less
C. little
D. few
单项选择题
The weather () us from climbing the mountain.

A. discharged
B. disguised
C. disturbed
D. discouraged
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