单项选择题

Decibel might be ______.

A．an effect of noise on human behavior
B．a person's distance to a noise source
C．a degree of deafness caused by noise
D．a measure of the loudness of sound

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热门试题

单项选择题

Noise differs from sound in that ______.

A．noise interferes with the task being done
B．noise is a special type of loud sound
C．noise is usually unavoidable in big cities
D．noise can be defined more precisely than sound

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