Noise can have unexpected harmful effects on performance of certain kinds of tasks, for instance, if one is performing a watch keeping task that requires vigilance, in which he is responsible for detecting weak signals of some kind (e.g., watching a radar screen for the appearance of aircraft).
Communicating with other people is unfavorably affected by noise. If you have ridden in the rear of a jet transport, you may have noticed that it was difficult to carry on a conversation at first, and that, eventually, you adjusted the loudness of your speech to compensate for the effect. The problem is noise.
20. Noise differs from sound in that ________.
[A] it is sounds that interfere with the task being done
[B] it is a special type of loud sound
[C] it is usually unavoidable in big cities
[D] it can be defined more precisely than the latter
21. One of the harmful effects of noise on human performance is that ________.
[A] it reduces ones sensitivity
[B] it renders the victim helpless
[C] it deprives one of the enjoyment of music
[D] it drowns out conversations at worksites
22. The purpose of this passage is ________.
[A] to define the effects of noise on human behavior
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