单项选择题

A．The trees are being cut down.
B．He needs more air-conditioning.
C．The trees help cool his house.
D．The trees are blocking his view.
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E
单项选择题
A．It can kill people.B．it can damage forests and plants.C．It can make it difficult to breathe.D．It can damage steel and concrete.
A．It can kill people.
B．it can damage forests and plants.
C．It can make it difficult to breathe.
D．It can damage steel and concrete.
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