A well-documented body of information existing shows that noise call affect human in both physiological and psychological ways.
　　Hearing losses in particular occupations such as boiler-making and construction work are well known.In fact，however，we all find heating more difficult as our age.Young ears can distinguish a wide range of sounds from low to very high frequencies，while older ears lose the ability to distinguish high-pitched sounds.A comparison of some industrialized versus non- industrialized peoples suggests that this hearing loss may not be the must-be result of old age.
　　Furthermore，a closer examination of other data reveals economic effects.For instance，airports are currently operating at less capacity because of noise regulations which restrict their hours of operation.Job performance can be seriously affected by loud noise，especially if accu-racy and mental effort are involved.The use of outdoor areas for conversation is not possible for an estimated 5 to 10 million people who live or work in urban areas.When interference with television or speech or sleep is included，as many as 22 to 44 miHion people cab be said to have lost part of the use of their homes and grounds because of noise.Thus noise pollution is a serious environmental concern.Much more effort should be made to waru people of the grave effects which may stop from an excessively noisy environment.
　　第16题 Boiler-making and construction work are given as examples of__________ .
　　A.noisy and hearing-affecting working environment
　　B.successful control of noise pollution
　　C.noise of very low or high frequencies
　　D.sources of high-pitched sound
　　答案：A
　　第17题 According to the passage，the fact that many people have poorer hearing when they grow old is.
　　A.the must-be result of old age.
　　B.probably related to the long-time exposure to loud noise
　　C.because they cannot distinguish high-pitched sounds
　　D.because their gays aye no longer young
　　答案：B
　　第18题 Because of noise pollution，many airports__________ .
　　A.have to operate for a longer time
　　B.can not operate any longer
　　C.have to reduce their operation hours
　　D.have to close earlier than usual
　　答案：C
　　第19题 Because of the loud noise，millions of people in urban areas__________ .
　　A.cannot watch TV
　　B.cannot have normal conversations in outdoor areas
　　C.cannot sleep well during the night
　　D.cannot give speech in public
　　答案：B
　　第20题 The best title for the passage might be__________ .
　　A.Economic Cohsequences of Noise
　　B.Ways of Controlling Noise
　　C.Sources of Loud Noise
　　D.Noise Pollution
　　答案：D

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