大学英语六级阅读理解30篇Word格式文档下载.docx

大学英语六级阅读理解30篇Word格式文档下载.docx

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atimeoflong,slowgrowthwhichextendedfromabout8,000BC.tillapproximatelyAD.1650.Inthefirstperiodofsome9600years,thepopulationincreasedfromsome8millionto500millionin1650.Between1650andthepresent,thepopulationhasincreasedfrom500milliontomorethan4billion.Anditis

estimatedthatbytheyear2000therewillbe6.2billionpeoplethroughouttheworld.Onewaytoappreciatethisdramaticdifferenceinsuchabstractnumbersistoreducethetimeframetosomethingthatismoremanageable.Between8000BCand1650,anaverageofonly50,000personswasbeingaddedannuallytotheworld’spopulationeachyear.Atpresent,thisnumberisaddedeverysixhours.Theincreaseisabout80,000,000personsannually.

1.Whichofthefollowingdemographicgrowthpatternismostsuitableforthelongthinpowderfuseanalogy?

A.Avirtuallystableorslightlydecreasingperiodandthenasuddenexplosionofpopulation.

B.Aslowgrowthforalongtimeandthenaperiodofrapid,dramaticincrease.

C.Toomanypeopleonearthandafewrapidincreaseinthenumberaddedeachyear.

D.Alongperiodwhendeathratesexceedsbirthratesandthenashortperiodwithhigherfertilityandlowermortality.

2.Duringthefirstperiodofdemographichistory,societieswereoftenindangerofextinctionbecause___.

A.onlyoneintenpersonscouldlivepast40.

B.therewashighermortalitythanfertilityinmostplaces.

C.itwastoodangeroustohavebabiesduetothepoorconditions.

D.ourancestorshadlittleenthusiasmformorechildren.

3.Whichstatementistrueaboutpopulationincrease?

A.Theremightbeanincreaseof2.2billionpersonsfromnowtotheyear2000.

B.About50,000babiesareborneverysixhoursatpresent.

C.Between8000BCandthepresent,thepopulationincreaseisabout80,000,000personseachyear.

D.Thepopulationincreasedfasterbetween8000BCand1650thanbetween1650andthepresent.

4.Theauthorofthepassageintendsto___.

A.warnpeopleagainstthepopulationexplosioninthenearfuture.

B.comparethedemographicgrowthpatterninthepastwiththatafter1650.

C.findoutthecauseforrapidincreaseinpopulationinrecentyears.

D.presentusaclearandcompletepictureofthedemographicgrowth.

5.Theword“demographic”inthefirstparagraphmeans___.

A.statisticsofhuman.

B.surroundingsstudy.

C.accumulationofhuman.

D.developmentofhuman.

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Mostofusaretaughttopayattentiontowhatissaid—thewords.Wordsdoprovideuswithsomeinformation,butmeaningsarederivedfromsomanyothersourcesthatitwouldhinderoureffectivenessasapartnertoarelationshiptorelytooheavilyonwordsalone.Wordsareusedtodescribeonlyasmallpartofthemanyideasweassociatewithanygivenmessage.Sometimeswecangaininsightintosomeofthoseassociationsifwelistenformorethanwords.Wedon’talwayssaywhatwemeanormeanwhatwesay.Sometimesourwordsdon’tmeananythingexcept“I’mlettingoffsomesteam.Idon’treallywantyoutopaycloseattentiontowhatI’msaying.JustpayattentiontowhatI’mfeeling.”Mostlywemeanseveralthingsatonce.Apersonwantingtopurchaseahousesaystothecurrentowner,“ThisstephastobefixedbeforeI’llbuy.”Theownersays,“It’sbeenlikethatforyears.”Actually,thestephasn’tbeenlikethatforyears,buttheunspokenmessageis:

“Idon’twanttofixit.Weputupwithit.Whycan’tyou?

”Thesearchforamoreexpansiveviewofmeaningcanbedevelopedofexaminingamessageintermsofwhosaidit,whenitoccurred,therelatedconditionsorsituation,andhowitwassaid.

Whenamessageoccurscanalsorevealassociatedmeaning.Letusassumetwocouplesdoexactlythesameamountofkissingandarguing.Butonecouplealwayskissesafteranargumentandtheothercouplealwaysarguesafterakiss.Theorderingofthebehaviorsmaymeanagreatdealmorethanthefrequencyofthebehavior.Afriend’sunusuallydocilebehaviormayonlybeunderstoodbynotingthatitwasprecededbysituationsthatrequiredanabnormalamountofassertiveness.Someresponsesmaybedirectlylinkedtoadevelopingpatternofresponsesanddefylogic.Forexample,apersonwhosays“No!

”toaserialsofchargeslike“You’redumb,”“You’relazy,”and“You’redishonest,”mayalsosay“No!

”andtrytojustifyhisorherresponseifthenextstatementis“Andyou’regoodlooking.”

Wewoulddowelltolistenforhowmessagesarepresented.Thewords,“Ifsurehasbeennicetohaveyouover,”canbesaidwithemphasisandexcitementorritualistically.Thephrasecanbesaidonceorrepeatedseveraltimes.Andthemeaningsweassociatewiththephrasewillchangeaccordingly.Sometimesifwesaysomethinginfrequentlyitassumesmoreimportance;

sometimesthemorewesaysomethingthelessimportanceitassumes.

1.Effectivecommunicationisrenderedpossiblebetweentwoconversingpartners,if___.

A.theyuseproperwordstocarrytheirideas.

B.theybothspeaktrulyoftheirownfeelings.

C.theytrytounderstandeachother’sideasbeyondwords.

D.theyarecapableofassociatingmeaningwiththeirwords.

2.“I’mlettingoffsomesteam”inparagraph1means___.

A.I’mjustcallingyourattention.

B.I’mjustkidding.

C.I’mjustsayingtheopposite.

D.I’mjustgivingoffsomesound.

3.Thehouse-owner’sexampleshowsthatheactuallymeans___.

A.thestephasbeenlikethatforyears.

B.hedoesn’tthinkitnecessarytofixthestep.

C.theconditionofthestepisonlyaminorfault.

D.thecostinvolvedinthefixingshouldbeshared.

4.Someresponsesandbehaviorsmayappearveryillogical,butarejustifiableif___.

A.linkedtoanabnormalamountofassertiveness.

B.seenasone’shabitualpatternofbehavior.

C.takenaspartofanorderingsequence.

D.expressedtoaseriesofcharges.

5.Theword“ritualistically”inthelastparagraphequalssomethingdone___.

A.withouttrueintention.

B.light-heartedly.

C.inawayofceremony.

D.withlessemphasis.

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Acontroversyeruptedinthescientificcommunityinearly1998overtheuseofDNA（deoxyribonucleicacid）fingerprintingincriminalinvestigations.DNAfingerprintingwasintroducedin1987asamethodtoidentifyindividualsbasedonapatternseenintheirDNA,themoleculeofwhichgenesaremade.DNAispresentineverycellofthebodyexceptredbloodcells.DNAfingerprintinghasbeenusedsuccessfullyinvariousways,suchastodeterminepaternitywhereitisnotclearwhothefatherofaparticularchildis.However,itisintheareaofcriminalinvestigationsthatDNAfingerprintinghaspotentiallypowerfulandcontroversialuses.

DNAfingerprintingandotherDNAanalysistechniqueshaverevolutionizedcriminalinvestigationsbygivinginvestigatorspowerfulnewtoolsintheattempttotroveguilt,notjustestablishinnocence.Whenusedincriminalinvestigations,aDNAfingerprintpatternfromasuspectiscomparedwithaDNAfingerprintpatternobtainedfromsuchmaterialashairsorbloodfoundatthesceneofacrime.AmatchbetweenthetwoDNAsamplescanbeusedasevidencetoconvictasuspect.

Thecontroversy 

in1998stemmedformareportpublishedinDecember1991bypopulationgeneticistsRichardC.LewontinofHarvardUniversityinCambridge,Mass.,andDanielL.HartlcalledintoquestionthemethodstocalculatehowlikelyitisthatamatchbetweentwoDNAfingerprintsmightoccurbychancealone.Inparticular,theyarguedthatthecurrentmethodcannotproperlydeterminethelikelihoodthattwoDNAsampleswillmatchbecausetheycamefromthesameindividualratherthansimplyfromtwodifferentindividualswhoaremembersofthesameethnicgroup.LewontinandHartlcalledforbettersurveysofDNApatternsmethodsareadequate.

Inresponsetotheircriticisms,populationgeneticistsRanajitChakrabortyoftheUniversityofTexasinDallasandKennethK.KiddofYaleUniversityinNewHaven,Conn.,arguedthatenoughdataarealreadyavailabletoshowthatthemethodscurrentlybeingusedareadequate.InJanuary1998,however,thefed