单项选择题

Environmental groups _________ a campaign against the widespread production of genetically modified crops.

A．underwent
B．established
C．regulated
D．launched
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单项选择题
This explains why even our most effective efforts to move people into jobs seem never to the welfare rolls.
A．squeeze
B．shrink
C．descend
D．decrease
单项选择题
The purpose of the psychologist's experiments is to test whether smoking has a positive effect on the mental _________ of smokers.
A．faculty
B．volume
C．capacity
D．competence
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