单项选择题

Scientists think that by the year 2000, _______.

A．people will generally improve their hearing
B．people will have worse hearing
C．people will wear contact lenses and hearing aids as well
D．people wearing hearing aids will outnumber those wearing contact lenses

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热门试题

单项选择题

Why does Ronald Reagan have to suffer permanent injury of heating Because _______.

A．his tight ear has been damaged
B．his nerve system is inefficient
C．there is some problem with his brain
D．some of the delicate hairs in his inner ear have suffered a great damage

单项选择题

Which of the following statements about the standard 90 db is NOT true

A．It suits everyone.
B．It can protect only 90 per cent of the working force.
C．It requires 16 quiet hours of rest each day for the ears to recover.
D．It can hardly be applied in reality.