2011年大學英語六級_閱讀理解107篇

1、不定期更新好資料不定期更新好資料1Wecanbeginourdiscussionof“populationasglobalissue”withwhatmostpersonsmeanwhentheydiscuss“thepopulationproblem”:toomanypeopleonearthatoorapidincreaseinthenumberaddedeachyear.ThefactsarenotindisputeItwasqu

2、iterighttoemploytheanalogythatlikeneddemographicgrowthto“alongthinpowderfusethatburnssteadilyhaltinglyuntilitfinallyreachesthegeexplodes.”Tounderstthecurrentsituationwhichisacterizedbyrapidincreasesinpopulationitisnecess

3、arytounderstthehistyofpopulationtrends.Rapidgrowthisacomparativelyrecentphenomenon.Lookingbackatthe8000yearsofdemographichistywefindthatpopulationshavebeenvirtuallystablegrowingveryslightlyfmostofhumanhisty.Fmostofouranc

4、estslifewashardoftennastyverysht.Therewashighfertilityinmostplacesbutthiswasusuallybalancedbyhighmtality.Fmostofhumanhistyitwasseldomthecasethatoneintenpersonswouldlivepastftywhileinfancychildhoodwereespeciallyriskyperio

5、ds.Oftensocietieswereincleardangerofextinctionbecausedeathratescouldexceedtheirbirthrates.Thusthepopulationproblemthroughoutmostofhistywashowtopreventextinctionofthehumanrace.Thispatternisimptanttonotice.Notonlydoesitput

6、thecurrentproblemsofdemographicgrowthintoahisticalperspectivebutitsuggeststhatthecauseofrapidincreaseinpopulationinrecentyearsisnotasuddenenthusiasmfmechildrenbutanimprovementintheconditionsthattraditionallyhavecausedhig

7、hmtality.Demographichistycanbedividedintotwomajperiods:atimeoflongslowgrowthwhichextendedfromabout8000BC.tillapproximatelyAD.1650.Inthefirstperiodofsome9600yearsthepopulationincreasedfromsome8millionto500millionin1650.Be

8、tween1650thepresentthepopulationhasincreasedfrom500milliontomethan4billion.itisestimatedthatbytheyear2000therewillbe6.2billionpeoplethroughoutthewld.Onewaytoappreciatethisdramaticdifferenceinsuchabstractnumbersistoreduce

9、thetimeframetosomethingthatismemanageable.Between8000BC1650anaverageofonly50000personswasbeingaddedannuallytothewld’spopulationeachyear.Atpresentthisnumberisaddedeverysixhours.Theincreaseisabout80000000personsannually.1.

10、WhichofthefollowingdemographicgrowthpatternismostsuitablefthelongthinpowderfuseanalogyA.Avirtuallystableslightlydecreasingperiodthenasuddenexplosionofpopulation.B.Aslowgrowthfalongtimethenaperiodofrapiddramaticincrease.C

11、.Toomanypeopleonearthafewrapidincreaseinthenumberaddedeachyear.D.Alongperiodwhendeathratesexceedsbirthratesthenashtperiodwithhigherfertilitylowermtality.2.Duringthefirstperiodofdemographichistysocietieswereoftenindangero

12、fextinctionbecause___.A.onlyoneintenpersonscouldlivepast40.B.therewashighermtalitythanfertilityinmostplaces.C.itwastoodangeroustohavebabiesduetothepoconditions.D.ourancestshadlittleenthusiasmfmechildren.3.Whichstatementi

13、strueaboutpopulationincreaseA.Theremightbeanincreaseof2.2billionpersonsfromnowtotheyear2000.B.About50000babiesarebneverysixhoursatpresent.C.Between8000BCthepresentthepopulationincreaseisabout80000000personseachyear.D.The

14、populationincreasedfasterbetween8000BC1650thanbetween1650thepresent.4.Theauthofthepassageintendsto___.A.warnpeopleagainstthepopulationexplosioninthenearfuture.parethedemographicgrowthpatterninthepastwiththatafter1650.C.f

15、indoutthecausefrapidincreaseinpopulationinrecentyears.D.presentusaclearcompletepictureofthedemographicgrowth.5.Thewd“demographic”inthefirstparagraphmeans___.A.statisticsofhuman.B.surroundingsstudy.C.accumulationofhuman.D

16、.developmentofhuman.答案：ABADA2Mostofusaretaughttopayattentiontowhatissaid—thewds.Wdsdoprovideuswithsomeinfmationbutmeaningsarederivedfromsomanyothersourcesthatitwouldhinderoureffectivenessasapartnertoarelationshiptorelyto

17、oheavilyonwdsalone.Wdsareusedtodescribeonlyasmallpartofthemanyideasweassociatewithanygivenmessage.Sometimeswecangaininsightintosomeofthoseassociationsifwelistenfmethanwds.Wedon’talwayssaywhatwemeanmeanwhatwesay.Sometimes

18、ourwdsdon’tmeananythingexcept“I’mlettingoffsomesteam.Idon’treallywantyoutopaycloseattentiontowhatI’msaying.JustpayattentiontowhatI’mfeeling.”Mostlywemeanseveralthingsatonce.Apersonwantingtopurchaseahousesaystothecurrento

19、wner“ThisstephastobefixedbefeI’llbuy.”Theownersays“It’s2.DNAfingerprintingcanbeunreliablewhen____.A.themethodsusedfbloodcellcalculationarenotaccurateB.twodifferentindividualsofthesameethnicgroupmayhavethesameDNAfingerpri

20、ntingpatternC.amatchisbychanceleftwithfingerprintsthathappentobelongtotwodifferentindividualsD.twodifferentindividualsleavetwoDNAsamples.3.TogeicistslikeLewontinHartlthecurrentmethod____.A.isnotsoconvincingastoexcludethe

21、likelihoodthattwoDNAsamplescannevercomefromtwoindividualsB.isarguablebecausetwoindividualsofthesameethnicgrouparelikelytohavethesameDNApattern.C.IsnotbasedonadequatescientifictheyofgeicsD.Istheeticallycontradictytowhatth

22、eyhavebeenstudying4.TheattitudeoftheFederalBereauofInvestigationshowsthat____.A.enoughdataareyettobecollectedfmvariousethnicgroupstoconfirmtheunlikelihoodoftwoDNAsamplescomingfromtwoindividualmembersB.enoughdataofDNAsamp

23、lesshouldbecollectedtoconfirmthatonlyDNAsamplesfmthesamepersoncanmatchC.enoughdataareyettobecollectedfromvariousethnicgroupstodeterminethelikelihoodoftwodifferentDNAsamplescomingfmthesamepersonD.additionalsamplesfromvari

24、ousethnicgroupsshouldbecollectedtodeterminethattwoDNAsamplesareunlikelytocomefromthesameperson5.NationalAcademyofSciencesholdsthestancethat____.A.DNAtestingshouldbesystematizedB.OnlyauthizedlabatiescanconductDNAtestingC.

25、TheacademyonlyisauthizedtowkoutstardsftestingD.TheacademyhastherighttoaccreditlabatiesfDNAtesting答案：CBABB4RacketdinclamnoisewhateveryouwanttocallitunwantedsoundisAmerica’smostwidespreadnuisance.Butnoiseismethanjustanuisa

26、nce.Itconstitutesarealpresentdangertopeople’shealth.Daynightathomeatwkatplaynoisecanproduceseriousphysicalpsychologicalstress.Nooneisimmunetothisstress.Thoughweseemtoadjusttonoisebyigningittheearinfactneverclosesthebodys

27、tillresponds—sometimeswithextremetensionastoastrangesoundinthenight.Theannoyancewefeelwhenfacedwithnoiseisthemostcommonoutwardsymptomofthestressbuildingupinsideus.Indeedbecauseirritabilityissoapparentlegislatshavemadepub

28、licannoyancethebasisofmanynoiseabatementprograms.Themesubtlemeserioushealthhazardsassociatedwithstresscausedbynoisetraditionallyhavebeengivenmuchlessattention.Neverthelesswhenweareannoyedmadeirritablebynoiseweshouldconsi

29、derthesesymptomsfairwarningthatotherthingmaybehappeningtoussomeofwhichmaybedamagingtoourhealth.Ofmanyhealthhazardstonoisehearinglossisthemostclearlyobservablemeasurablebyhealthprofessionals.Theotherhazardsarehardertopind

30、own.Fmanyofustheremaybeariskthatexposuretothestressofnoiseincreasessusceptibilitytodiseaseinfection.Themesusceptibleamongusmayexperiencenoiseasacomplicatingfactinheartproblemsotherdiseases.Noisethatcausesannoyanceirritab

31、ilityinhealthpersonsmayhaveseriousconsequencesfthesealreadyillinmindbody.Noiseaffectsusthroughoutourlives.Fexamplethereareindicationsofeffectsontheunbnchildwhenmothersareexposedtoindustrialenvironmentalnoise.Duringinfanc

32、ychildhoodyoungstersexposedtohighnoiselevelsmayhavetroublefallingasleepobtainingnecessaryamountsofrest.WhythenistherenotgreateralarmaboutthesedangersPerhapsitisbecausethelinkbetweennoisemanydisabilitiesdiseaseshasnotyetb

33、eenconclusivelydemonstrated.Perhapsitisbecausewetendtodismissannoyanceasapricetopayflivinginthemodernwld.Itmayalsobebecausewestillthinkofhearinglossasonlyanoccupationalhazard.1.InParagraph1thephrase“immuneto”areusedtomea

34、n___.A.unaffectedbyB.hurtbyC.unlikelytobeseenbyD.unknownby2.Theauth’sattitudetowardnoisewouldbestbedescribedas___.A.unrealisticB.traditionalC.concernedD.hysterical3.WhichofthefollowingbeststatesthemainideaofthepassageA.N

35、oiseisamajproblemmostpeoplerecognizeitsimptance.B.Althoughnoisecanbeannoyingitisnotamajproblem.C.Noiseisamajproblemhasnotyetbeenrecognizedassuch.D.Noiseisamajproblemaboutwhichnothingcanbedone.4.Theauthcondemnsnoiseessent