单项选择题

One special feature of Crystal Ear is that

A．you can control its volume.
B．you needn't take it off every day.
C．It is solar-powered.
D．It saves power.
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单项选择题
According to the passage, hearing loss is
A．only a minor health problem.
B．the world's most common health problem.
C．merely a teenage disease.
D．an incurable disease.
单项选择题
Many people leave their hearing problem untreated because
A．it is not serious.
B．Crystal Ear is not yet available.
C．it is not easy to have it treated.
D．they don't want to look old.
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