Do you think there is too much noise(嘈杂声,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(喷气式飞机).It is said that the noise of planes or trains or trucks can make one deaf(耳聋)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(功率强大的喇。八)is a new danger(危险) It can reach 120 decibels(120 分贝).

It is known that continuous(连续不断的)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(使聋)by the noise. Besides,noise of less than 85 decibels can make some people tired and anxious(焦虑的) 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,损害)to health and prevent (妨碍)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.选择最佳答案。

(   ) 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.根据首字母提示补全单词。

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.

 Sometimes something looks different from another thing,but it is usually the same. Sometimes something looks the same as another thing,but it is really different.

Sometimes we cannot believe our eyes. Here is an example. If we are standing in front of an entrance of a tunnel,we can see the other end where we go out. We feel the entrance much bigger than the other end. If we go through the tunnel,we find that the ends are the same size. One is not bigger than the other. They are the same size.

Now let’s turn around and look through the tunnel from the other end. Now we find that the end near us looks bigger. The other end looks smaller. But we know that they are the same size.

Things that are near us seem big. Things that are not near us seem small. We know that one lamp post in the streets is just like another. They are all equally tall. But if an artist draws a picture of a street,he will not make the lamp posts all the same size. He will make the first one big,the second one a little smaller,and the third one a little smaller than the second one. The ones that are the farthest away are the smallest. When things move away,they look smaller. When things come nearer,they look bigger.

1.选择最佳答案。

(   ) 1) A tunnel is usually         .

A. the same size at each end

B. in different sizes at the end

C. bigger at one end than the other end

D. smaller at one end than the other     end

(   ) 2) We can         what we see.

A. always believe     B. not believe at all

C. sometimes not believe     D. be sure

(   ) 3) The lamp-posts in the streets         .

A. are not equally high     B. are all equally high

C. are bigger and bigger     D. are smaller and smaller

(   ) 4) Things that are near         than  things  that are not near.

A. are bigger     B. are smaller

C. seem bigger     D. seem smaller

(   ) 5) When things are moving,they look     .

A. bigger when they come near

B. smaller when they come near

C. bigger when they move away

D. the same size when they move away

2.根据首字母提示补全单词。

1) It seems that the two ends of a tunnel are in d          sizes  when you are in front of the entrance.

2) In fact,one end of a tunnel is as b         as  the  other.

3) Stars in the sky look brighter than the others because they are n         to us.

4) When a plane flies farther,it looks s      .

5) In an artist’s picture,the lamp-post in the streets are not the s          size.

 Are you nervous? Maybe you should sit in a blue room. Are you always 1     ?  Maybe  you should sit in a room painted in a “warm color” such as soft orange. Are you often 2     ? You’ll feel happier if you sit in a yellow room. Some researchers believe that color has the power to affect our 3     . They believe the colors affect almost everyone in the 4      way. They tested this 5      in different settings.

One study was in a 6     . The researchers painted heavy boxes white and light boxes black.

They wanted to see how color 7      the workers’ feelings. Which boxes did they think were more difficult to lift? The heavy white ones? No. They thought the black boxes were more difficult to lift. The white boxes were heavier but they looked 8       . The researchers think that this is 9      light colors seem light.

10      study was at a hospital with brown and green-grey walls. Painters 11      the hospital walls in 12      colors—bright orange on the first floor,bright pink on the second floor,and bright green on the third floor. What do you think happened? The hospital says the doctors and nurses also changed and were 13      about work.

If this is true,people might want to think 14      about the colors around them—not only in houses,15       in  offices,schools,hospitals,gyms,prisons,museums and restaurants!

(   ) 1. A.  cold  B. warm     C. excited  D. happy

(   ) 2. A.  surprised  B. excited     C. sad  D. scared

(   ) 3. A.  health  B. minds     C. feelings  D. behaviors

(   ) 4. A.  different  B. same     C. right  D. wrong

(   ) 5. A.  exam  B. book     C. news  D. idea

(   ) 6. A.  house  B. workplace     C. school  D. hospital

(   ) 7. A.  changed  B. influenced     C. told  D. found

(   ) 8. A.  empty  B. heavy     C. full  D. light

(   ) 9. A.  because  B. why     C. that  D. so

(   ) 10. A.  Others  B. The other     C. Other  D. Another

(   ) 11. A.  repeated  B. reused     C. repainted  D. repaired

(   ) 12. A.  bright  B. dark     C. same  D. light

(   ) 13. A. more afraid     B. more worried C. happier     D. sadder

(   ) 14. A.  politely  B. carefully     C. quietly  D. quickly

(   ) 15. A.  or  B. though     C. and  D. but

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