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  3. Psychologists now believe that noise has a considerable effect on people’s attitudes and behavior. Experiments have proved that

Psychologists now believe that noise has a considerable effect on people’s attitudes and behavior. Experiments have proved that

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问题     Psychologists now believe that noise has a considerable effect on people’s attitudes and behavior. Experiments have proved that in noisy situations (even temporary ones), people behave more irritably and less cooperatively; in more permanent noisy situations, many people cannot work hard, and they suffer from severe anxiety and other psychological problems.
    However, psychologists distinguish between "sound" and "noise". "Sound" is measured physically in decibels. "Noise" cannot be measured in the same way because it refers to the psychological effect of sound and its level of "intensity" depends on the situation. Thus, for passengers at an airport who expect to hear airplanes taking off and landing, there may be a lot of sound, but not much noise (that is, they are not bothered by the noise). By contrast, if you are at a concert and two people behind you are whispering, you feel they are talking noisily even if there is not much sound. You notice the noise because it affects you psychologically.
    Both sound and noise can have negative effects, but what is most important is whether the person has control over the sound. People walking down the street with earphones, listening to music that they enjoy, are receiving very high decibels of sound, but they are probably happy to hear the sound that they control. On the other hand, people in the street without earphones must tolerate a lot of noise which they have no control over. It is noise pollution that we need to control in order to help people live more happily.
"Sound", as defined by the psychologist, ________.
选项 A、can be measured in the same way that "noise" is measured
B、may be extremely harmful to health
C、is not at all different from "noise"
D、can be measured by machines
答案D
解析 根据第二段第二句“‘Sound’is measured physically in decibels. ”可知，声音在物理上是用分贝来测量的。由此可推知，声音可以被机器测量。故选D。
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