2021年6月英语四级阅读练习题

2021年6月英语四级阅读练习题（答案版

（-）

Oceanographyhasbeendefinedas“Theapplicationofall

sciencestothestudyofthesea”.

Beforethenineteencentury,scientistswithaninterest

intheseawerefewandfarbetween.CertainlyNewtonconsidered

sometheoreticalaspectsofitinhiswritings,buthewas

reluctanttogotoseatofurtherhiswork.

Formostpeopletheseawasremote,andwiththeexception

ofearlyintercontinentaltravelersorotherswhoearneda

livingfromthesea,therewaslittlereasontoaskmany

questionsaboutit,letalonetoaskwhatlaybeneaththe

surface.Thefirsttimethatquestion“Whatisatthebottom

oftheoceans?vhadtobeansweredwithanycommercial

consequencewaswhenthelayingofatelegraphcablefromEurope

toAmericawasproposed.Thehadtoknowthedepthprofile（起

伏形状）oftheroutetoestimatethelengthofcablethathad

tobemanufactured,mote,andwiththeexceptionofearly

intercontinentaltravelersorotherswhoearneda1ivingfrom

thesea,therewaslittlereasontoaskmanyquestionsabout

it,letalonetoaskwhatlaybeneaththesurface.Thefirsttime

thatquestion“Whatisatthebottomoftheoceans?”hadto

beansweredwithanycommercialconsequencewaswhenthelaying

ofatelegraphcablefromEuropetoAmericawasproposed.The

engineershadtoknowthedepthprofile（起伏形状）oftheroute

toestimatethelengthofcablethathadtobemanufactured.

ItwastoMauryoftheUSNavythattheAtlanticTelegraph

Companyturned,in1853,forinformationonthismatter.Inthe

1840s,Mauryhadbeenresponsibleforencouragingvoyages

duringwhichsoundings（测身）weretakentoinvestigatethe

depthsoftheNorthAtlanticandPacificOceans.Later,some

ofhisfindingsarousedmuchpopularinterestinhisbookThe

PhysicalGeographyoftheSea.

Thecablewaslaid,butnotuntil1866wastheconnection

madepermanentandreliable.Attheearlyattempts,thecable

failedandwhenitwastakenoutforrepairsitwasfoundto

becoveredinlivinggrowths,afactwhichdefiedcontemporary

scientificopinionthattherewasnolifeinthedeeperparts

ofthesea.

Withinafewyearsoceanographywasunderway.In1872

Thomsonledascientificexpedition（考察），whichlastedfor

fouryearsandbroughthomethousandsofsamplesfromthesea.

Theirclassificationandanalysisoccupiedscientistsfor

yearsandledtoafive-volumereport,thelastvolumebeing

publishedin1895.

题目：Choosecorrectanswerstothequestion:

1.TheproposaltolayatelegraphcablefromEuropeto

Americamadeoceanographicstudiestakeon.

A.anacademicaspect

B.amilitaryaspect

C.abusinessaspect

D.aninternationalaspect

2.ItwasthataskedMauryforhelpinoceanographic

studies.

A.theAmericanNavy

B.someearlyintercontinentaltravelers

C.thosewhoearnedalivingfromthesea

D.thecompanywhichproposedtolayanunderseacable

3.TheaimofthevoyagesMaurywasresponsibleforinthe

1840swas.

A.tomakesomesoundingexperimentsintheoceans

B.tocollectsamplesofseaplantsandanimals

C.toestimatethelengthofcablethatwasneeded

D.tomeasurethedepthsofthetwooceans

4.“Defied“inthe5thparagraphprobablymeans

a，，

A.doubted

B.gaveproofto

C.challenged

D.agreedto

5.Thispassageismainlyabout.

A.thebeginningsofoceanography

B.thelayingofthefirstunderseacable

C.theinvestigationofoceandepths

D.theearlyintercontinentalcommunications

参考答案：

1.EC］事实判断题。文章第3段第2句提到，这个问题的解答是

具有商业结果的。C中的business为原文中commercial同义改写，

故选Co

2.［D］细节题。文章第4段首句为一个强调句，强调的是宾语。

题干也是一个强调句型，但强调的是主语。如果把原文的强调句型改

为一般的句型，就知道向Mauiry寻求帮助的是theAtlantic

TelegraphCompany.故答案为D。A是Maury的工作单位，可以排除;

原文只提到对于一些早期的穿越洲际的旅行家和依靠海洋维持生计

的人，海洋并不遥远，故B、C与题意不符。

3.［D］事实判断题。文章第4段提到，19世纪40年代，Maury

负责推动进行测深工作的海上航行，以此来探测北大西洋与太平洋的

深度.故选Do

4.[C]词义推断题。当时的科学观点是海洋较深的地方不存在生

命，而事实上在电缆表面发现了活的生物.由此可知这一事实对当时

的科学观点提出质疑，故答案为C。

5.[A]主旨题。通读全文可知，oceanography（海洋学）是全文的

中心词，本文主要讲述海洋学是如何起步的，故答案为A。B、C只

表述了原文中个别细节，并非主题;D跟全文无关。

（二）

Happinesscanbedescribedasapositivemoodandapleasant

stateofmind.Accordingtorecentpolls（民意测验）sixtyto

seventypercentofAmericansconsiderthemselvestobe

moderatelyhappyandoneintwentypersonsfeelsveryunhappy.

Psychologistshavebeenstudyingthefactorsthatcontribute

tohappiness.Itisnotpredictablenorisapersoninan

apparentlyidealsituationnecessarilyhappy.Theideal

situationmayhavelittletodowithhisactualfeelings.

Agoodeducationandincomeareusuallyconsidered

necessaryforhappiness.Thoughbothmaycontribute,theyare

onlychieffactorsifthepersonisseriouslyundereducatedor

actuallysufferingfromlackofphysicalneeds.

Thericharenotlikelytobehappierthanthemiddle-income

grouporeventhosewithverylowincomes.Peoplewithcollege

educationsaresomewhathappierthanthosewhodidnotgraduate

fromhighschool,anditisbelievedthatthisismainlybecause

theyhavemoreopportunitytocontroltheirlives.Yetpeople

withahighincomeandacollegeeducationmaybelesshappy

thanthosewiththesameincomeandnocollegeeducation.

Poorhealthdoesnotruleouthappinessexceptforthe

severelydisabledorthoseinpain.Learningtocopewitha

healthproblemcancontributetohappiness.Thosewithagood

sexlifearehappieringeneral,butthosewhohavealoving,

affectionaterelationshiparehappierthanthosewhorelyon

sexalone.Lovehasahighercorrelationwithhappinessthan

anyotherfactor.

Itshouldbenotedthatpeoplequicklygetusedtowhatthey

have,andtheyarehappiestwhentheyfeeltheyareincreasing

theirlevelnomatterwhereitstandsatagiventime.

Childrenwhoseparentswerehappilymarriedhavehappier

childhoodsarenotnecessarilyhappieradults.

Thebestformulaforhappinessistobeabletodevelopthe

abilitytotoleratefrustration,tohaveapersonalinvolvement

andcommitment,andtodevelopself-confidenceand

self-esteem.

1.Itcanbeinferredfromthepassagethat.

A.happinessispredictable

B.apersoninanapparentlyidealsituationmustbehappy

C.thericharelikelytobehappierthanthemiddle-income

group

D.happinessisnotnecessarilyconnectedtoone's

situationinsociety

2.Peoplewithcollegeeducation.

A.arenothappierthanthosewhohaveonlyaneducation

athighschool

B.aremuchhappierthanthosewhodidnotgraduatefrom

highschool

C.havelessopportunitytocontroltheirlives

D.havemoreopportunitytocontroltheirlives

3.Accordingtothearticle,happinessisgreatlydependent

upon.

A.ahappychildhood

B.greatwealth

C.afeelingthatconditionsarebecomingforthebetter

D.acollegedegree

24.Whichofthefollowingismostlikelytocontributeto

happiness?

A.Beingexceptionallygood-looking.

B.Havingaloving,affectionaterelationship.

C.Havingagoodpayingjob.

D.Meetinglotsofpeople.

5.Whichofthefollowingattitudesorfeelingsismost

likelytobefoundinhappypeople?

A.Havingself-esteem.

B.Beingsureofkeepingeverythingtheyalreadyhave.

C.Neverbeingjealous.

D.Knowinghowtobecharming.

答案：1.D2.D3.C4.B5.A

（三）

TheNationalTrustinBritainplaysanincreasingly

importantpartinthepreservationforpublicenjoymentofthe

bestthatisleftunspoiledoftheBritishcountryside.

AlthoughtheTrusthasreceivedpracticalandmoralsupportfrom

theGovernment,itisnotrichGovernmentdepartment.Itisa

charitywhichdependsforitsexistenceonvoluntarysupport

frommembersofthepublic.

Theattentionofthepublicwasfirstdrawntothedangers

threateningthegreatoldhousesandcastlesofBritainbythe

deathofLordLothian,wholefthisgreatseventeenth-century

housetotheTrusttogetherwiththe4,500-acreparkandestate

surroundingit.Thisgiftattractedwidepublicityandstarted

theTrust's"CountryHouseScheme”.Underthisscheme,withthe

helpoftheGovernmentandthegeneralpublic,theTrusthas

beenabletosaveandopentothepublicaboutonehundredand

fiftyoftheseoldhouses.Lastyearaboutoneandthreequarters

ofamillionpeoplepaidtovisitthesehistorichouses,usually

ataverysmallcharge.

InadditiontocountryhousesandopenspacestheTrustnow

ownssomeexamplesofancientwindandwatermills,nature

reserves,fivehundredandfortyfarmsandnearlytwothousand

fivehundredcottagesorsmallvillagehouses,aswellassome

completevillages.Inthesevillagesnooneisallowedtobuild,

developordisturbtheoldvillageenvironmentinanywayand

allthehousesaremaintainedintheiroriginal

sixteenth-centurystyle.Overfourhundredthousandacresof

coastline,woodland,andhillcountryareprotectedbythe

Trustandnodevelopmentordisturbanceofanykindare

permitted.Thepublichasfreeaccesstotheseareasandisonly

askedtorespectthepeace,beautyandwildlife.

SoitisthatoverthepasteightyyearstheTrusthasbecome

abigimportantorganizationandanessentialandrespected

partofnationallife,preservingallthatisofgreatnatural

beautyandofhistoricalsignificancenotonlyforfuture

generationsofBritonsbutalsoforthemillionsoftourists

whoeachyearinvadeBritaininsearchofagreathistorical

andculturalheritage.

练习题：Choosecorrectanswerstothequestion:

1.TheNationalTrustis.

A.arichgovernmentdepartment

B.acharitysupportedmainlybythepublic

C.agroupofareasofgreatnaturalbeauty

D.anorganizationsupportedbypublictaxes

2.The"CountryHouseScheme"wasstarted.

A.withthefoundingoftheNationalTrust

B.asthefirstprojectoftheNationalTrust

C.afterLordLothian'sdonation

D.toprotectLordLothian'shouse

3.LandprotectedbytheNationalTrust.

A.canbedevelopedandmodernized

B.includesnaturallyandhistoricallyvaluablesites

C.consistsofcountryhousesandnaturereserves

D.isprimarilyfortouriststoBritain

4.Theword"invade"inthelastparagraphisusedto

emphasizethat.

A.theBritishdonotliketourists

B.touriststoBritainareunfriendly

C.touristscometoBritaininlargenumbers

D.Britainisattackedbymassesoftourists

5.Themainpurposeofthispassageisto.

A.informthereadersabouttheNationalTrust

B.promotetheNationalTrust,smembership

C.makepeopleawareofthenaturalbeautyofBritain

D.letthegeneralpublicsharetheviewsoftheNational

Trust

答案：

1.[B]事实细节题。从文章第1段末句可找到答案。选项A显

然与原文意思相反，选项C和D则无原文依据。

2.[C]推理判断题。第2段第2句表明洛锡安勋爵捐赠了他的

房产后，这个计划才启动起来，因此选项C正确，也由此可以否定选

项A。根据第2段最后两句可知这个计划是为了保护具有历史价值的

房子,而不仅仅是为了保护洛锡安勋爵的房子，因此选项D不对。

3.[B]事实细节题。最后一段从preserving开始的部分指出了

本题的答案。第3段倒数第2句所说的"nodevelopmentor

disturbancesofanykindarepermitted”可帮助排除选项A;选

项C内容不完整;选项D中的限制词primarily使用不妥,无原文依

据。

4.[C]词义推断题。由invade所在的句子Kforthemillions

oftouristswhoeachyearinvade.。”可知这是托管会保护自然

美景和历史胜地的原因所在。从而可以推断出invade强调来英国游

玩的游客之多，因此选项C为正确答案。

5.[A]主旨大意题。纵观全文可发现theNationalTrust和

theTrust在文章开头以及文中反复出现,文章是一篇说明文，主要

目的是介绍theNationalTrust的机构性质及其功能，因此选项A

正确。文章未讨论托管会的成员问题，因此选项B不正确。最后两段

虽然提到英国的自然景色很美，但这并非文章的主题思想，因此选项

C不对。本题最具干扰性的是选项D,但是本文并不是一篇议论文，

其目的不是让读者认同其中的观点，文章更多的是用说明性的语言来

说明托管会的一些做法。

（四）

网络商业

InthefirstyearorsoofWebbusiness,mostoftheaction

hasrevolvedaroundeffortstoLaptheconsumermarket.More

recently,astheWebprovedtobemorethanafashion,companies

havestartedtobuyandsellproductsandserviceswith

oneanother.Suchbusiness-to-businesssalesmakesensebecause

businesspeopletypicallyknowwhatproductthey'relooking

for.

Nonetheless,manycompaniesstillhesitatetousetheWeb

becauseofdoubtsaboutitsreliability.''Businessesneedto

feeltheycantrustthepathwaybetweenthemandthesupplier,“

sayssenioranalystBlaneErwinofForresterResearch.Some

companiesarelimitingtheriskbyconductingonline

transactionsonlywithestablishedbusinesspartnerswho

aregivenaccesstothecompany'sprivateintranet.

AnothermajorshiftinthemodelforInternetcommerce

concernsthetechnologyavailableformarketing.Untilrecently,

Internetmarketingactivitieshavefocusedonstrategiesto

"pull"customersintosites.Inthepastyear,however,

softwarecompanieshavedevelopedtoolschatallowcompaniesto

"push"informationdirectlyouttoconsumers,transmitting

marketingmessagesdirectlytotargetedcustomers,Mostnotably,

thePointcastNetworkusesascreensavertodelivera

continuallyupdatedstreamofnewsandadvertisementsto

subscribers;computermonitors.Subscriberscancustomizethe

informationtheywanttoreceiveandproceeddirectlytoa

company,sWebsite.CompaniessuchasVirtualVineyardsare

alreadystartingtousesimilartechnologiestopushmessages

tocustomersaboutspecialsales,productoffering,orother

events.ButpushtechnologyhasearnedthecontemptofmanyWeb

users.Onlineculturethinkshighlyofthenotionthatthe

informationflowingontothescreencomestherebyspecific

request.Oncecommercialpromotionbeginstofillthescreen

uninvited,thedistinctionbetweentheWebandtelevisionfades.

Thar'saprospectthathorrifiesNetpurists.

ButitishardlyinevitablethatcompaniesontheWebwill

needtoresorttopushstrategiestomakemoney,Theexamples

ofVirtualVineyards,Aandotherpioneersshowthat

aWebsitesellingtheright,kindofproductswiththeright

mixofinteractivity,hospitality,andsecuritywillattract

onlinecustomers,Andthecostofcomputingpowercontinuesto

freefall,whichisagoodsignforanyenterprisesettingup

shopmsilicon.Peoplelookingback5orlOyearsfromnowmay

wellwonderwhysofewcompaniestooktheonlineplunge.

1.WhatdowelearnaboutthepresentWebbusiness?

A)Webbusinessisnolongerinfashion.

B)Business-to-businesssalesarethetrend.

C)Webbusinessisprosperousintheconsumermarket.

D)ManycompaniesstilllackconfidenceinWebbusiness.

2.EstablishedbusinesspartnersarepreferredinWeb

businessbecause.

A)theyaremorecreditablethanothers

B)theyspecifytheproductstheywant

C)theyhaveaccesstothecompany,sprivateintranet

D)theyarecapableofconductingonlinetransactions

3.PointcastNetworkismostprobably.

A)acompanythatdevelopsthelatestpushsoftware

B)atoolthatpromotesacompany,sonlinemarketing

C)thefirs!companythatusedanonlinepushsoftware

D)themostpopularsoftwarethathelpsacompanypush

4.Netpuristsarcmostworriedthat.

A)onlytherequestedinformationcomestothescreen

B)theNetisfilledwithcommercialpromotion

C)thedifferencebetweentheWebandTVwillfade

D)pushtechnologywilldominatethescreenofthe

computers

5.Whatdoestheauthorintendtoexpressbymentioning

Amazon,com'?

A)Itssuccessisattributedtopushstrategies.

B)Itisprosperouswithoutpushstrategies.

C)Itishighlyconcernedaboutthecostofcomputingpower.

D)Itisagoodexampleoftheflourishingonlinebusiness.

答案:

1.对于目前的网络商务我们知道什么？

A）网络商务不再时兴。

B）企业对企业电子商务是潮流。

0网络商务在消费市场正兴旺。

D）许多公司对网络商务依然缺少自信。

[D]第2段开头的Nonetheless表明该句与首段提到的内容有转

折关系，而D与该句内容相同，为本题答案。

2.在网络商务中已建立关系的商业伙伴是优先的，因为o

A）他们比其他人更可信

B）他们能详细说明自己想要的产品

C）他们拥有进入公司专用内部网的权利

D）他们能够进行网上交易

[A]由第2段最后一句可知公司这样做的原因是为“控制风险”,

而再由上文中的reliability,trust等词可看出风险问题是源于''信

誉”问题，只有A与该段所说的核心意思相符，故选A。

3.PointcastNetwork最可能是。

A）研发最新推销软件的公司

B）促进公司网上营销的工具

C）第一家使用网上推销软件的公司

D）帮助公司进行推销的最流行软件

[A]第3段第4句开头的Mostnotably表明该句提及的Pointcast

Network是说明上一句观点的例子，由此可见，PointcastNetwork

应为一家开发软件的公司，因此A为本题答案。

4.网络纯粹主义者最担心o

A）只有被需求的信息显示在屏幕上

B）网络中满是商业促销

C）网络和电视的区别会淡化

D）网上推销技术将掌控屏幕

[D]第3段末句开头的That'saprospect表明前面提到的内容

就是使网络净化者觉得担忧的问题，上文说网络广告不应像电视那样

不请自来，由此可见，网络净化者最担心的是以后电脑屏幕会被不请

自来的广告占据，因此D为本题答案。

5.关于亚马逊我们能推断出什么？

A）其成功源于网上推销策略。

B）它没有采用推销策略，仍很繁荣。

C）它对计算能力的花费高度关注。

D）它是繁荣的网络商务的一个很好的例子。

[B]末段首句中的hardlyinevitable（不是不可避免）表明有些

公司不使用“推销”策略也可取得成功，第2句以Amazon.com为例

说明这个观点，由此可见,B正确而A错误。

（五）

动物世界

Naturally,magroupofanimalsasdiverseasthesnakes,

andwithsomanyvariedenemies,therearenumerousdefensive

reactionsanddevices.Thereis.however,onegeneralpattern

ofbehavior.Inthepresenceofsuspectedenemythefirst

reactionistotrytoescapeobservation;ifthisfails,the

nextresortistheflightcosomeinaccessibleretreat,butif

thisisnotpossible,oriscircumvented.variouskindsof

intimidatorygesturesandwarningdevicesarebrought

intoplay;inthelastresortthesnakeattacks.This

patternvaneswiththecircumstances;somestagesmaybe

omittedorcombinedunpredictablywhilstallsomenotoriously

irasciblespeciesmaydispensewithallthepreliminariesand

attackalmostatonce,thoughseldomorneverwithoutsome

provocation.

Amongstthefactorsthatincreaseaggressivenessare

hunger,thematingseasonandsurprise,withthelastmentioned

thecommonest;whenhuntingforfoodorformate,activityand

theaggressiveinstinctarebothattheirpeak.Owingtotheir

poorsenseofhearingsnakesareveryliabletobe,quite

literally,caughtnappingandasimilarsituationarisesduring

theirperiodsoftemporaryblindnessjustbeforesloughing（蜕

皮）begins.Byfarthegreatestnumberofsnake-bitaccidents

resultfromtheunwittingdisturbanceofrestingsnakes,and

thishazardismuchincreasedwithspeciesthatarewell

disguisedandwhosenaturalinstinctistotrusttothis

concealmentastheirprincipaldefense.Aswellasdifferences

inaggressivenessbetweenindividualsofthesamespecies

accordingtothecircumstancesandconditions,therearealso

notabledifferencesbetweenspecies,evencloselyallied

species;andthereportsofthosewhohavebeenattackedmay

understandablybelackinginobjectivity.Soitisimpossible

toforecast,eveninoutline,howanyencounterwilldevelop.

TheHamadryad,forexample,isusuallycreditedwithbeing

amongstthemostaggressiveofsnakes.andtherearemany

accountsofunprovokedattacks,yetononeoccasionfourteenmen

andsevendogspassedandreturnedwithintwoyardsfromanest

andnosnakewasseenalthoughthefemale,whichguardsthenest,

couldnothavebeenfaraway.

1.Whenasnakemeetsapotentialenemy,itsprimarydevice

is.

A)avoidinganyobservation

B)Findingasafeshelter

C)givingawarningthreat

D)startingaquickattack

2.Theunderlinedphrase''dispensewithallthe

preliminaries“inParagraphImostprobablymeans.

A)thesnakescombineallthepreviousthreesteps

B)thesnakesgiveupallthepreviousthreesteps

C)chesnakesfollowallthepreviousstepsonebyone

D)thesnakesreversetheorderofalltheprevioussteps

3.Asnakeismostaggressivewhen.

A)itmeetsapossibleenemy

B)itiscaughtwhenitissleepingorsloughing

C)itisdisturbedunknowingly

D)itseeksapartnerinchematingseason

4.Itisdifficulttopredictwhatwouldhappenwhenasnake

meetsamanbecause.

A)noonebaseverclearlyknownhowhehimselfwasbit

B)mantendstobesubjectivewhenhedescribeshis

encounterwithasnake

C)theaggressivenessofthesnakesdiffersaccordingto

diversesituations

D)asnakedoesnotbegincoattackwithoutprovocation

5.Theauthorusestheexampleinthelastparagraphm

supporthisideathat.

A)snakesdonotbegintheaggressiveactifitisnot

disturbed

B)somesnakesaremoreaggressiveandmorereadytoattack

C)itishardtoforecastwhetherandhowsnakeswould

attack

D)snakesoftenconcealthemselvesastheirprincipal

defense

答案：

1.当蛇遇到了潜在的敌人，它主要的做法会是。

A）避开任何监视

B）找一个安全的庇护场所

C）给出一个警告威胁

D）开始快速攻击

[A]首段第3句提到了蛇遇到可疑敌人时的行为模式：首先躲开

对方的监视，第二步是寻找安全藏身处，第三是向对方发出警告，最

后实施攻击，因此选项A为本题答案。选项B、C和D分别是对第二、

第三和最后一步的近义替换，因此都不是正确答案。

2.第1段里含有下划线的短语“dispensewithallthe

preliminaries”的意思最可能是。

A）蛇结合了所有之前的三个步骤

B）蛇会放弃所有之前的三个步骤

C）蛇会依据之前的步骤一步一步进行

D）蛇会保留所有之前步骤的顺序

[B]首段最后一句中dispensewith的前面提到过somestages

maybeomittedorcombined,而下文提至Uattackalmostatonce,

这税明dispensewith应表示有些蛇不做前几个步骤，而立刻展开进

攻，因此它的意思应等同于omit”免除，省略”,也即选项B中的give

upo其他选项语法上都说得通，但是与下文的attackalmostatonce

不一致，因此都不是正确答案。

3.蛇最有攻击性的时候是o

A）遇到了可能是敌人的动物

B）在睡觉或蜕皮的时候给提住

C）在其没有防备的情况下受到干扰

D）在交配季节求偶的时候

[D]第2段首句中第2个分句的mate一词与选项D同义，因此选

项D为本题答案。其他选项都在文中提到过，也是蛇会对敌人实施还

击的情况，但是这三个干扰项和正确选项之间的区别就在于，文中没

有提到在这些情况下"Asnakeismostaggressive（蛇最具有攻击

性）”，因此本题要紧扣第2段首句和其中的peak这个单词。

4.很难预测当蛇遇到人的时候会发生什么事情，因为o

A）从来就没有人知道是怎么被蛇攻击的

B）在形容与蛇遭遇的情形时，人们总是主观性较强

C）在不同的情况下蛇的攻击性程度都不一样

D）没有遭到挑衅的话，蛇是不会攻击人的

[C]第2段最后两句由So连接，显示倒数第2句是原因，最后一

句是结果。选项C是对倒数第2句的概括，为本题答案。选项A和选

项D与题干之间没什么关联，易排除;选项B虽然与该段倒数第2句

的后一个分句意思相符，但它只是作为附加信息以说明蛇的个体行为

差异很大，故也可排除。

5.在最后一个段落中，作者使用了例子来支持他的观点:

A）如果不受干扰的话，蛇是不会率先发起攻击行为的。

B）一些蛇更具攻击性，也更趋向随时进行攻击。

C）很难预测蛇是否会做出攻击，会怎样做出攻击。

D）蛇主要的防卫方式就是隐藏自己。

[C]第3段开头就有forexample这个标志性的词组，表明这一

句是为了支持上文的例子。结合第2段末句可知，第3段是为了证明

其不可预测性的，故C正确。

（六）

城市发展

Masstransportationrevisedthesocialandeconomicfabric

oftheAmericancityinthreefundamentalways.Itcatalyzed

physicalexpansion,itsortedoutpeopleandlanduses,andit

acceleratedtheinherentinstabilityofurbanlife.Byopening

vastareasofunoccupiedlandforresidentialexpansion,the

omnibuses,horserailways,commutertrains,andelectric

trolleyspulledsettledregionsoutwardtwotofourtimesmore

distantformcitycentersthantheywereinthepremodernera.

In1850,forexample,thebordersofBostonlayscarcelytwo

milesfromtheoldbusinessdistrict;bytheturnofthecentury

theradiusextendedtenmiles.Nowthosewhocouldaffordit

couldlivefarremovedfromtheoldcitycenterandstillcommute

thereforwork,shopping,andentertainment.Thenew

accessibilityoflandaroundtheperipheryofalmostevery

majorcit