单项选择题

Noise pollution is the worst kind of pollution.

A． Right.
B． Wrong.
C． Doesn’t say.
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单项选择题
Hundreds of years ago, people went to visit theft friends on foot.
A． Right.
B． Wrong.
C． Doesn’t say.
单项选择题
Factories must clean their water before it is thrown away.
A． Right.
B． Wrong.
C． Doesn’t say.
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