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
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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
单项选择题
A painter chooses certain shapes and colors out of the countless billions because he believes they
A．are easy to make out
B．can bring delight to him
C．are worth showing to the public
D．are particular
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