阅读理解

Whenweseewell，wedonotthinkaboutoureyesveryoften.Itisonlywhenwecannotseeperfectlythatwerealizehowimportantoureyesare.

Peoplewhoarenear-sightedcanonlyseethingsthatareveryclosetotheireyes.Everythingelseseemsblurry（unclear）.Manypeoplewhodoalotofwork，suchaswriting，readingandsewingbecomenear-sighted.

ThenPeoplewhoarefar-sightedsufferfromjusttheoppositeproblem.Theycanseethingsthatarefaraway，buttheyhavedifficultyinreadingabookunlesstheyholditatarm&rsquoslength.Iftheywanttodomuchreading，theymustgetglasses，too.

Otherpeopledonotseeclearlybecausetheireyesarenotexactlytherightshape.Theyhavewhatiscalledastigmatism（散光）.This，too，canbecorrectedbyglasses.Somepeople&rsquoseyesbecomecloudybecauseofcataracts（白内障）.Longagothesepeopleoftenbecameblind.Nowhowever，itispossibletooperateonthecataractsandremovethen.

Havingtwogoodeyesisimportantforjudgingdistances.Eacheyeseesthingsfromaslightlydifferentangle（角度）.Toprovethistoyourself，lookatanobjectoutofoneeyethenlookatthesameobjectoutofyourothereye.Youwillfindtheobject&rsquosrelationtothebackgroundandotherthingsaroundithaschanged.Thedifferencebetweenthesetwodifferenteyeviewshelpsustojudgehowfarawayanobjectis.Peoplewhohaveonlyoneeyecannotjudgedistanceaspeoplewithtwoeyes.

（1）Weshouldtakegoodcareofoureyes.

[　　]

A.onlywhenwecanseewell

B.onlywhenwecannotseeperfectly

C.evenifwecanseewell

D.onlywhenwerealizehowimportantoureyesare

（2）Whenthingsfarawayseemunclear，oneisprobably

[　　]

A.near-sighted

B.far-sighted

C.astigmatic

D.sufferingfromcataracts

（3）Theunderlinedwordsufferinthethirdparagraphprobablymeans.

[　　]

A.experience

B.imagine

C.feelpain

D.areaffectedwith

（4）Havingtwoeyesinsteadofoneisparticularlyusefulfor

[　　]

A.seeingatnight

B.seeingobjectsfaraway

C.lookingoverawidearea

D.judgingdistances

（5）Peoplewhosufferfromastigmatismhave.

[　　]

A.oneeyebiggerthantheother

B.eyesthatarenotexactlytherightshape

C.adifficultythatcanbecorrectedbyanoperation

D.aneyedifficultthatcannotbecorrectedbyglasses
正确答案：
1.C

2.A

3.D

4.D

5.B