单项选择题

When the tank can carrying poisonous gas ran off the rails the firemen tried to______ the village from all traffic.

A．dismiss
B．insulate
C．isolate
D．expel
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单项选择题
Under her administration claim the critics,______ high-rise construction has destroyed the character of the city's downtown darkening its streets and driving business.
A．rapid
B．rampant
C．speedy
D．random
单项选择题
All experts agree that the most important consideration with diet drugs is carefully______ the risks and benefits.
A．weighing
B．valuing
C．evaluating
D．distinguishing
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