单项选择题

According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.

A．one hour
B．two hours
C．half an hour
D．three hours
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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
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.
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