单项选择题

Several()for global warming have been suggested by climate researchers.

A. systems
B. sentences
C. fallacies
D. hypotheses

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单项选择题
There changes have not been sufficient to()the losses.

A. stem
B. stimulate
C. cause
D. compensate
单项选择题
The protests were part of their()against the proposed building development in the area.

A. commission
B. commitment
C. convention
D. campaign
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