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
B.
B．it
C.
C．It
D.
D．It
E.
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单项选择题
A．A crowded city.B．A busy airport.C．A steel factory.D．An old car park.
A.A
B.
B．A
C.
C．A
D.
D．An
E.
单项选择题
矿井风流中硫化氢浓度不超过（）%。

A.0.0024
B.0.00025
C.0.00066
D.0.0005
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