单项选择题

Which of the following is NOT true of Crystal Ear

A．It is highly sensitive.
B．It is powerful.
C．It is invisible.
D．It is wireless.
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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.
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.
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