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
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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
单项选择题
______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth
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