15.When we can see well,we do not think about our eyes very often.It is only when we cannot see perfectly that we come to see how important our eyes are.
People who are nearsighted can only see things that are very close to their eyes.Many people who do a lot of close work,such as writing,reading and sewing,become nearsighted.Then they have to wear glasses in order to see distant things clearly.
People who are farsighted(近視的) suffer from just the opposite problem.They can see things that are far away,but they have difficulty reading a book unless they hold it at arm's length.If they want to do much reading,they must get glasses too.
Other people do not see clearly because their eyes are not exactly the right shape.This,too,can be corrected by glasses.Some people's eyes become cloudy(渾濁的) because of cataracts(白內(nèi)障).Long ago these people often became blind.Now,however,it is possible to operate on the cataracts and remove them.
When night falls,colors become fainter to the eye and finally disappear.After your eyes have grown used to the dark,you can see better if you use the sides of your eyes rather than the centers.Sometimes,after dark,you see a small thing to one side of you,which seems to disappear if you turn you head in its direction.This is because when you turn your head,you are looking at the thing too directly.Men on guard duty sometimes think they see something moving to one side of them.When they turn to look straight at it,they cannot see it anymore,and they believe they were mistaken.However,this mistake happens because the center of the eye,which is very sensitive(敏感的) in daylight,is not as sensitive as the sides of the eyes after dark.

26.We don't know that our eyes are of great importance untilB.
A.we think about our eyes   
B.we cannot see clearly
C.we wear glasses         
D.we have to do much reading
27.According to the passage,aA is more likely to be nearsighted.
A.writer       B.doctor      
C.guard        D.painter
28.Those who suffer from cataractsC.
A.will become blind       
B.cannot be cured (治愈)
C.may be cured          
 D.must move to other places
29.People who are farsightedA.
A.cannot do a lot of close work without glasses
B.can only see things that are very close to their eyes
C.have difficulty reading a book if they hold it at arm's length
D.have the same problem as the nearsighted people
30.To see a small thing at night,it is better to lookD.
A.with wide open eyes       
B.with half-shut or narrowed eyes
C.straight at it              
D.in a slightly different direction.

分析 本文講述了眼只能看清近處的東西,看不清遠(yuǎn)處的東西.而遠(yuǎn)視眼只能看清遠(yuǎn)處的東西而看不清近處的東西.

解答 26:B 細(xì)節(jié)理解題.根據(jù):It is only when we can not see perfectly that we come to see how important our eyes are.只有當(dāng)我們不能很好看清楚東西的時候,我們才會意識到眼睛的重要性.可知本題答案為B選項.
27:A 細(xì)節(jié)理解題.根據(jù):Many people who do a lot of close work,such as writing and reading,become nearsighted.很多做寫作和讀書這樣近距離工作的人會變得近視.可知本題答案為A選項"學(xué)生".              
28.C 細(xì)節(jié)理解題.根據(jù)文章內(nèi)容Now,however,it is possible to operate on the cataracts and remove them.可以通過手術(shù)治療.故選C.
29:A 細(xì)節(jié)理解題.根據(jù):People who are farsighted…they have difficulty reading a book unless they hold it at arm's length.遠(yuǎn)視的人讀書有困難,除非他們把書放在一臂遠(yuǎn).可知遠(yuǎn)視者看不清近處的東西,故本題答案為A選項.                        
30:D 細(xì)節(jié)理解題.根據(jù):After your eyes have grown used to the dark,you can see better if you use the side of your eyes rather than the centers.在你逐漸適應(yīng)黑夜之后,如果你用側(cè)面看而不是用眼中間看,效果會更好.可知本題答案為D選項"朝著稍稍不同的方向(而不是正對物體的方向)".

點(diǎn)評 本文是社會文化類閱讀理解.做這類題材閱讀理解時要求考生對文章通讀一遍,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進(jìn)行仔細(xì)分析,結(jié)合選項選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù)

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