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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(近视的) 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(浑浊的) because of cataracts(白内障).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 本文讲述了眼只能看清近处的东西,看不清远处的东西.而远视眼只能看清远处的东西而看不清近处的东西.

解答 26:B 细节理解题.根据:It is only when we can not see perfectly that we come to see how important our eyes are.只有当我们不能很好看清楚东西的时候,我们才会意识到眼睛的重要性.可知本题答案为B选项.
27:A 细节理解题.根据:Many people who do a lot of close work,such as writing and reading,become nearsighted.很多做写作和读书这样近距离工作的人会变得近视.可知本题答案为A选项"学生".              
28.C 细节理解题.根据文章内容Now,however,it is possible to operate on the cataracts and remove them.可以通过手术治疗.故选C.
29:A 细节理解题.根据:People who are farsighted…they have difficulty reading a book unless they hold it at arm's length.远视的人读书有困难,除非他们把书放在一臂远.可知远视者看不清近处的东西,故本题答案为A选项.                        
30:D 细节理解题.根据: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.在你逐渐适应黑夜之后,如果你用侧面看而不是用眼中间看,效果会更好.可知本题答案为D选项"朝着稍稍不同的方向(而不是正对物体的方向)".

点评 本文是社会文化类阅读理解.做这类题材阅读理解时要求考生对文章通读一遍,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据

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