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.
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单项选择题
A．People will become seriously ill.B．People will become dependent on them.C．They will make people feel tired.D．They will give people headaches.
A．People will become seriously ill.
B．People will become dependent on them.
C．They will make people feel tired.
D．They will give people headaches.
单项选择题
A．They don’t help sports players at all.B．They don’t live up to their fame.C．They may be comfortable but are too expensive.D．They are good for track and field sports but not for ball games.
A．They don’t help sports players at all.
B．They don’t live up to their fame.
C．They may be comfortable but are too expensive.
D．They are good for track and field sports but not for ball games.
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