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
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.
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.
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