单项选择题

Silver is the best conductor of electricity, copper______it closely.

A．followed
B．following
C．to follow
D．being followed
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单项选择题
The river was______ with waste from that factory. Some measures must be taken to stop its production.
A．corrupted
B．consumed
C．contaminated
D．infected
单项选择题
It' s time ______about the noise pollution late at night.
A．something will be done
B．everything is done
C．something was done
D．everything will be done
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