19.When we can see well,we do not think about our eyes often.It is only when we can not 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 and reading,become nearsighted.Then they have to wear glasses in order to see distant things clearly.
People who are farsighted face 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 because of cataracts.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 eyes and finally disappear.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.Sometimes,after dark,you see a small thing to one side of you,which seems to disappear if you turn your 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 can not see it any more,and they believe they were mistaken.However,this mistake happens because the center of the eye,which is very sensitive in daylight,is not as sensitive as the sides of the eye after dark.
25.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
26.According to the passage,aA is more likely to be nearsighted.
A.student
B.doctor
C.guard
D.painter
27.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.can correct their eyes by glasses.
28.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 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 25-28.BAAD
25題答案: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.
26題答案: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".
27題答案: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.
28題答案: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)".
點評 本文是一篇科教類閱讀,題目涉及多道細(xì)節(jié)理解題,做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進行仔細(xì)分析,結(jié)合選項選出正確答案.推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案.