单项选择题

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

A．imposed
B．impulsed
C．implemented
D．incorporated
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单项选择题
Millions of farmers, drawn by the ______ of employment, came into the city which made the problems of transportation and housing even more serious.
A．prosperity
B．prospect
C．expectation
D．anticipation
单项选择题
Nowadays, skilled workers such as carpenters, electricians and TV repairmen often have higher income than college graduates. The old distinction that white-collar workers make a better living than blue-collar workers no longer______ true.
A．hold
B．stay
C．come
D．become
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