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

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热门试题

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

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