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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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单项选择题Initially the writer did not want to buy a hearing aid because

A．it would make him look old.
B．it would make him nervous.
C．it was too expensive.
D．it was old-styled.

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.