单项选择题

Because there is evidence of severely harmful effects from chemical dumps, the government has tougher cleanup measures.

A．innovated
B．imposed
C．implemented
D．inflicted
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单项选择题
Of all the senses that help a small baby to distinguish his mother, sight is _________.
A．permanent
B．prevalent
C．predominant
D．preliminary
单项选择题
Sometimes the tension produced by fears is so great that we cannot suppress it. At such times we need to _________ the tension by laughing or crying.
A．disperse
B．discard
C．disguise
D．discharge
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