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单项选择题

A．Because they have had little exposure to high level of sounds.
B．Because they suffer from hearing loss.
C．Because they don’t know how to operate stereo systems.
D．Because they are not qualified engineers.
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单项选择题A．A housewife.B．A singer.C．A teacher.D．A musician.

A．A housewife.
B．A singer.
C．A teacher.
D．A musician.

单项选择题A．The room is on fire.B．The two persons are bothered by the smoke.C．There is very little breeze.D．The two persons are not permitted in the room.

A．The room is on fire.
B．The two persons are bothered by the smoke.
C．There is very little breeze.
D．The two persons are not permitted in the room.