单项选择题

The purpose of this passage is ______.

A．to give advice as to how to prevent hearing loss
B．to define the effects of noise on human behavior
C．to warn people of the danger of noise pollution
D．to tell the difference between noise and sound

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热门试题

单项选择题

Jet aircraft is mentioned in the passage as an example of ______.

A．means of modern transport
B．sources of loud sound
C．people's interest in noise
D．movements to reduce noise

单项选择题

One of the harmful effects of noise on human performance is that ______.

A．it deprives one of the enjoyment of music
B．it drowns out conversation at worksites
C．it reduces one's sensitivity to sound
D．it makes the victim helpless in everything