单项选择题

The discoveries of science often are a mixed blessing. On the one hand they give us valuable pesticides that enable the farmer to grow more abundant crops and on the other hand they ______ the benefits by destroying the balance of nature.

A．compromise
B．misplace
C．damage
D．counterract
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单项选择题
The meeting was ______ over by the mayor to discuss the tax raise in the city.
A．presumed
B．propelled
C．presided
D．pricked
单项选择题
His strange behavior had greatly ______ me and my friends as well that evening.
A．perplexed
B．exhausted
C．exclaimed
D．exceeded
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