单项选择题

At the level of 115 decibels, permanent hearing damage can occur after just ______.

A．15 minutes
B．100 minutes
C．60 minutes
D．105 minutes
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单项选择题
Which of the following is NOT TRUE according to the passage
A．Headsets shouldn't be used any more.
B．We should use headsets in a proper way.
C．Noise is dangerous to our hearing.
D．Damage caused by noise may not be found in the early years of life.
单项选择题
Noise-induced hearing loss is ______.
A．apparent
B．quick
C．rough
D．unnoticed
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