Do you think there is too much noise(嘈雜聲，噪音)in our city? Perhaps  you do.  If  you  live near an airport,you will probably(可能)feel unhappy because of the noise  of jet planes(噴氣式飛機).It is said that the noise of planes or trains or trucks can make one deaf(耳聾)if he keeps on hearing it.

Noise is a kind of pollution(污染).However,most people in our city do not seem to mind noise. They do not know it is harmful(有害的)to their health. They like to enjoy music when they are doing their work. The music that is played through powerful loudspeakers(功率強大的喇。八)is a new danger(危險) It can reach 120 decibels(120 分貝).

It is known that continuous(連續(xù)不斷的)noise of over 85 decibels can make people deaf. For example,when newspapers and books are being printed(印刷),the noise is over 85 decibels,and some of the workers become deaf. Scientists believe that 10 percent(百分比)of all the workers in British printing offices have been deafened(使聾)by the noise. Besides,noise of less than 85 decibels can make some people tired and anxious(焦慮的) We all know that too much noise makes life difficult and unpleasant(令人不徹快的). It can do great harm(危害，損害)to health and prevent (妨礙)people from working well. Workers in noisy offices are not so efficient(有效的)as workers in quiet offices. Noise makes people less efficient. Can anything be done to keep down (降低) noise?

In Britain,the government has made several laws(法律)to keep down noise. It has spent a good deal of money making airports and main roads quieter. In Japan,America and Canada there are such laws,too.

1.選擇最佳答案。

(   ) 1)          people  in  big  cities know noise does harm to their- health.

A. Few     B. Most  C. No     D. Many

(   ) 2) Many people working in printing offices become deaf because        .

A. they keep on hearing the noise of the machines

B. they are not used to the noise of the machines

C. the noise of the machines is below 85 decibels

D. they don’t know the noise will harm their hearing

(   ) 3) If you often hear the noise below 85 decibels,your will        .

A. become deaf     B. feel tired

C. be happy     D. work harder

(   ) 4) Workers in noisy offices ate not so        as workers in quiet offices.

A. efficient     B. harmful  C. anxious     D. unpleasant

(   ) 5) When a person visits a factory full of loud noise，          .

A. he will become     deaf  B. he will feel uncomfortable(不舒服的)

C. his hearing will     be  greatly harmed D. he will never     mind  the  noise

2.根據(jù)首字母提示補全單詞。

1) To keep on hearing n        can  make one deaf.

2) When they are enjoying music,they don’t know the  noise is h      to their health.

3) People get tired if they stay in n      places  for  a  long time.

4) Workers can’t work e      in an office with  too  much noise.

5) L      must be made to keep down noise.

 1. 1) A 2) A  3) B  4) A 5) B

2. 1) noise 2) harmful  3) noisy  4) efficiently 5) Laws

題目來源：初中英語丟分題每周一練九年級全一冊 > 能力訓(xùn)練22

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