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
They ______ those who didn't conform to their ideas, and took advantage of those who agreed with them.
A．explored
B．persecuted
C．extended
D．pinched
单项选择题
For many young people during the Roaring Twenties, a disgust with the excesses of American culture ______ a wanderlust to provoke an exodus abroad.
A．overwhemed
B．reflected
C．combined with
D．hindered
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