单项选择题

People can do nothing about pollution.

A．Right.
B．Wrong.
C．Doesn’t say.
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单项选择题
Modem machines only bring people problems.
A．Right.
B．Wrong.
C．Doesn’t say.
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.
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