大学英语六级改革适用（阅读）模拟试卷72（共240题）

大学英语六级改革适用（阅读）模拟试卷72（共9套）（共240题）大学英语六级改革适用（阅读）模拟试卷第1套一、仔细阅读(本题共20题，每题1.0分，共20分。)Historianscantracethefoundationsofplasticsurgeryasfarbackasabout2,600yearsagotoancientIndiawherefacialsurgerywerecarriedout.ThetechniqueswererecordedintheearlyHindutextsandwereusedprimarilyonsoldiersinjuredduringconflict.Thebirthofcosmeticreconstructivesurgerytrulyoccurredmanyhundredsofyearslater,andoverthepasttenyearsplasticsurgeryhasbecomeverypopularwithmoreandmorepeoplerefusingtogrowoldgracefully.Itishowevernotlimitedtoyoungwomenconsideringthefacteatingdisordersareontheriseamongyoungmen;menandwomenalikeareinterestedincosmeticsurgeryanditevengainspopularityinmainstreamculture.Itseemsthatnolongerarepeoplejudgedontheirabilitiesalonebutontheirappearance,andmoreandmoreofpeoplearechoosingtogoundertheknifeinanefforttoshapethemselvesintoanobjectiveandarbitraryidealbeauty.The"image"ofbeautyportrayedbythemediaisusuallyrelatedtotheobjectives,young,veryslim,andmostoftenwhite.Havingabodyweightof15%belownormalforone'sheight,ageandweightisconsideredideal.Inotherwordspeopleshouldbeanorexictomeetthemedia'simageofbeauty.Themessageisthatonlytheirimposedimageofbeautyisacceptable,andthosewhoarelarger,shorter,thicker,orbrownerarenot.Thisidealimageandweight,however,isunattainablefor99%ofwomen.Ironically,mostimagesofmodelsappearingonmagazineshavebeenairbrushedtoperfectiontoattainthat"perfect"imageofbeauty.Sadly,formanypeople,thequestforbeautyhasturnedintoanall-outobsession.Unsurprisingly,thenewfoundobsessionisaconvenientmarketingtoolbecause99%ofthefemalepopulationisnotsatisfiedwiththeirappearanceandthereforewillbemorelikelytobuyslimming,cosmeticsorturntoplasticsurgery.Thedietingindustrymakesanincredible$33billionayear.Theindustryusesmediatokeeppeoplethinkingthattheyshouldmaintaintheslenderorevenskinnyshape.Thisimageofbeautyissimplyunattainableandthedesireforitwillneverbemetsothedemandfortheindustrywillneverdecrease.Andtheveryindustriesthatprofitfromfuelinginadequacy,afeelingofnotbeinggoodenough,willcontinuetoprosper.1、Plasticsurgerywasmainlyprovidedfor______atfirst.A、kingsB、queensC、injuredsoldiersD、historians标准答案：C知识点解析：细节题。题干问，整形手术早期主要用于谁身上。原文第一段最后一句，“ThetechniqueswererecordedintheearlyHindutextsandwereusedprimarilyonsoldiersinjuredduringconflict．”早期的印度课本里记录了这项技术，并且它主要应用在战争中受伤的军人身上。所以，正确答案是C。选项A与B未在文中出现；选项D。为干扰项，出现在开头，但历史学家认为此技术可以追溯到2600年前，而不是应用在他们身上。2、Theword"mainstream"(Line5,Para.2)isclosestinmeaningto______.A、dominatedB、worldwideC、standardD、maternal标准答案：A知识点解析：语义题。单词所在原句为“itevengainspopularityinmainstreamculture．”词意可以通过联系下文推断出，紧接的一句解释到，人们不再以能力而是以长相来评价一个人。大多数人都这样认为，可知是在主流文化中也流行。或者根据构词法，main(主要的)+stream(溪流)，合成词为“主流”。主流文化即占主导的文化，所以正确答案是A．“主导的”。选项D，maternal为“母系”的意思。3、Whatistheidealimageofbeautyintheperspectiveofthemassmediaaccordingtothepassage?A、Tall,strongandwhite.B、Elegant,healthyandwhite.C、Short,thickandbrown.D、Young,slimandwhite.标准答案：D知识点解析：细节题。根据题干关键词“idealimage”，定位于原文第三段第一句，“Theimageofbeautyportrayedbythemediaisusuallyrelatedtotheadjectives，young，veryslim，andmostoftenwhite．”明确指出，大众媒体描绘的美女形象是，年轻、很苗条、白净。所以，正确答案是D。选项B为干扰项，优雅与健康常常是生活中大家的看法．但并没有在文中提及。4、Whatistheauthor’sattitudetotheidealimageofbeautyportrayedbymedia?A、Positive.B、Neutral.C、Notclear.D、Negative.标准答案：D知识点解析：态度题。作者对媒体描绘的理想美女形象持什么态度?第三段第三句，“Inotherwordspeopleshouldbeanorexictomeetthemedia’simageofbeauty．”意为，也就是说想要达到媒体宣传的美的形象，人们要得厌食症。其次，该段最后一句用词。ironically“具有讽刺意味的是”。从这两处可判断作者持反对态度。5、Whythemassmediaportrayedtheidealimageinsuchwayaccordingtothepassage?A、Becausethemassmediaareexpectedtosatisfyaudiences.B、Becauseitmotivatesfemalestopursue"thebest"sothatbusinessmencouldmakemoneyfromtheindustry.C、Becauseitgiveswomenmoreconfidenceinthemselves.D、Becausethequestforbeautyliesineveryone’sheart.标准答案：B知识点解析：细节题。题干意为，大众媒体为什么将美女形象刻画成这样?根据原文最后一段．“Thisimageofbeautyissimplyunattainableandthedesireforitwillneverbemetsothedemandfortheindustrywillneverdecrease．Andtheveryindustriesthatprofitfromfuelinginadequacy，afeelingofnotbeinggoodenough，willcontinuetoprosper．”意思是．这种美的形象很难达到，所以对美的要求也永远无法达到。这样通过利用不满足感，产业会持续兴隆。可知，正确答案是B。GeneticEngineeringisaradicalandrapidlydevelopingtechnologythattouchesourlivesthroughitsapplicationinmedicine,forensics,industryandagriculture.ThroughthissciencehumansarefastinbecomingthearchitectsoflifebuttherearethosewhowarnagainsttheunknowndangersofplayingGodwhileothersseeitsbenefitsinourfightagainstdiseaseandtheproductionofabundantfoodsupplies.Inthepast50years,plantandanimalproductionhasincreaseddramatically.Today,thehumanpopulationisthelargestithaseverbeenandfortunatelyweproducemorefoodpercapitathaneverbefore.Despitethefactthatwehaveenoughfoodforeverysinglehumanbeingtohaveanadequatediet,about1billionpeoplestillsufferfrommalnutritionandhunger.Alotoftheincreaseinfoodproductionisattributedtoefficientfarmingmethodsandenvironmentalfactorssuchasirrigation,pestandweedcontrolbutthelargestcontributingfactorismodernplantandanimalbreeding.SowhatareGMfoodsandwhataretheconcernsfortheconsumer?ThemaindifferencebetweenGMfoodsandtraditionalbreedingmethodsisthedirectmodificationormanipulationofcertaingenes.Traditionalmethodsinvolvemixingthousandsofgeneswhereasgeneticmodificationallowsjustoneindividualgene,orasmallnumberofgenes,tobeinsertedintoaplant,oranimal.ThebenefitsofGMfoodsareenormous.Geneticmodificationcanbeusedtogivecropsimmunitytoplantvirusesortoimprovethenutritionalvalueofaplant.Inanimalsintendedforfood,geneticmodificationcouldpotentiallyincreasehowfastandhowbigtheygrow.Starvationonanypartoftheplanetcouldbeathingofthepastaswecouldcontroltheyield,varietiesandsizeoffoodsandproducestrainsthatareresistanttopests,areextremeintemperatureandaretoleranttoherbicides.OpponentsofGMfoodshoweverconsidertheirproductiontobetheworld'sbiggestuncontrolledbiologicalexperiment,adisasterwaitingtohappen.Thebiggestconcernsaretheeffectsthatanuncontrolledgeneticallymodifiedspeciescouldpotentiallyhaveonhumanandanimalhealth,agriculture,andontheenvironmentasawhole.Geneticallymodifiedspecieshavethepotentialtobecomebiologicalpollutantsthatarefarworsethanchemicalpollutantsastheywouldbevirtuallyimpossibletocontrolsincetheyarealive,migrateandcouldmutateproducingevenmoredangerousoffspring.Thiscouldleadtoirreversibledamagetotheecologyoftheplanet.6、Theauthordefinesgeneticengineeringas______.A、abrandnewtechnologythatwillshapeourplanetB、anupdatedtechnologythatmerelybenefithumanbeingsC、adangeroustechnologythatshouldbefunctionedinthelaboratoryD、anewandemergingtechnologythathashadaneffectonmanyaspectsofourlives标准答案：D知识点解析：细节题。原文第一段第一句话明确表明，“GeneticEngineeringisaradicalandrapidlydevelopingtechnologythattouchesourlivesthroughitsapplicationinmedicine，forensics，industryandagriculture．”即对应选项D，基因工程是一项新出现的技术．它对我们生活的方方面面产生影响。7、Whatisthemostsignificantelementfortheincreaseinfoodproduction?A、Modernplantandanimalbreeding.B、Efficientfarmingmethods.C、Environmentalfactors.D、Newirrigationsystem.标准答案：A知识点解析：细节题。根据关键词“increaseinfoodproduction”定位于第二段最后一句，“Alotoftheincreaseinfoodproductionisattributedto…butthelargestcontributingfactorismodernplantandanimalbreeding．”粮食增产归功于高效的耕作方式和一些环境因素，但最重要的是现代动植物品种的繁殖，所以，正确答案是A。选项B、C为干扰项，都是原因，但不是主要的因素。8、WhatisthemaindifferencebetweenGeneticEngineeringandtraditionallybredfoods?A、Thedifferenceliesinthemethodsandthenumberofgenes.B、Theyhavedifferentsizeandcolor.C、Traditionalmethodsarenotattractedbyconsumers.D、GeneticEngineeringismoreefficient.标准答案：A知识点解析：细节题。原文第四段第二句与第三句，明确指出传统繁殖和转基因食品的差异在于对特定遗传因子的直接改良或操作。传统的方法将数千种遗传因子混在一起．而遗传改良则把一个或少量的遗传因子注入体内。可知应选A，在方法和基因的数量上有差别。9、Whydoestheauthorclaimthatstarvationcouldbeathingofthepastinparagraph4?A、BecauseGMisimmunetoplantviruses.B、Thetemperaturecanbemodifiedbyscientists.C、Scientistswillbeabletocontrolthesize,varietyandimmunityofcropsandanimals.D、Peopleareeasilyaccessibletofoodnowadays.标准答案：C知识点解析：细节题。原文第四段最后一句，明确指出“Starvationonanypartoftheplanet…andaretoleranttoherbicides．”由于可以控制食品的生产量、变种、规格等，生产出抗虫性强，耐温性强、耐除草剂的物种，饥饿便不复存在了。选项C与原文大意相符。10、WhatisthemainoppositiontotheproductionofGMfoods?A、Chemicalpollutantsaremoredangerous.B、Thepotentialofproducingharmfuloffspringcouldnotbecontrolled.C、GMfoodsarenotproperlytested.D、Thereleaseoflargerspeciesintotheenvironment.标准答案：B知识点解析：细节题。题干问，反对转基因食品的主要理由是?文章第五段，“theywouldbevirtuallyimpossibletocontrol…”，很难去控制转基因中的有害物质，所以，正确答案是B。Therecent,apparentlysuccessfulpredictionbymathematicalmodelsofanappearanceofEINino—thewarmoceancurrentthatperiodicallydevelopsalongthePacificcoastofSouthAmerica—hasexcitedresearchers.JacobBjerknespointedoutover20yearsagohowwindsmightcreateeitherabnormallywarmorabnormallycoldwaterintheeasternequatorialPacific.Nonetheless,untilthedevelopmentofthemodelsnoonecouldexplainwhyconditionsshouldregularlyshiftfromonetotheother,ashappensintheperiodicoscillationsbetweenappearancesofthewarmEINinoandthecoldso-calledanti-ElNino.Theanswer,atleastifthecurrentmodelthatlinksthebehavioroftheoceantothatoftheatmosphereiscorrect,istobefoundintheocean.IthaslongbeenknownthatduringanElNino,twoconditionsexist:unusuallywarmwaterextendsalongtheeasternPacific,principallyalongthecoastsofEcuadorandPeru,andwindsblowfromthewestintothewarmerairrisingoverthewarmwaterintheeast.Thesewindstendtocreateafeedbackmechanismbydrivingthewarmersurfacewaterintoa"pile"thatblocksthenormalupwellingofdeeper,coldwaterintheeastandfurtherwarmstheeasternwater,thusstrengtheningthewindstillmore.ThecontributionofthemodelistoshowthatthewindsofanElNino,whichraisesealevelinthecast,simultaneouslysendasignaltothewestloweringsealevel.Accordingtothemodel,thatsignalisgeneratedasanegativeRossbywave,awaveofdepressed,ornegative,sealevel,matmoveswestwardparalleltotheequatorat25to85kilometersperday.TakingmonthstotraversethePacific,RossbywavesmarchtothewesternboundaryofthePacificbasin,whichismodeledasasmoothwallbutinrealityconsistsofquiteirregularislandchains,suchas,thePhilippinesandIndonesia.Whenthewavesmeetthewesternboundary,theyarereflected,andthemodelpredictsthatRossbywaveswillbebrokenintonumerouscoastalKelvinwavescarryingthesamenegativesea-levelsignal.Theseeventuallyshoottowardtheequator,andthenheadeastwardalongtheequatorpropelledbytherotationoftheEarthataspeedofabout250kilometersperday.WhenenoughKelvinwavesofsufficientamplitudearrivefromthewesternPacific,theirnegativesea-levelsignalovercomesthefeedbackmechanismtendingtoraisethesealevel,andtheybegintodrivethesystemintotheoppositecoldmode.Thisproducesagradualshiftinwinds,onethatwilleventuallysendpositivesea-levelRossbywaveswestward,wavesthatwilleventuallyreturnascoldcycle-endingpositiveKelvinwaves,beginninganotherwarmingcycle.11、Whichofthefollowingbestdescribestheorganizationofthefirstparagraph?A、Amodelisdescribedanditsvalueassessed.B、Aresultisreportedanditsimportanceexplained.C、Aphenomenonisnotedanditssignificancedebated.D、Ahypothesisisintroducedandcontraryevidencepresented.标准答案：B知识点解析：推断题。根据第一段的整体结构Therecent，apparentlySuccessfulprediction．．．hasexcitedresearchers．．．Nonetheless．untilthedevelopmentofthemodelsnoonecouldexplainwhy…分析．该段首先介绍了数学模式对厄尔尼诺现象的发生进行了成功的预测，这次预测鼓舞了研究人员。而这些数学模式发展出来之前．没有人能够解释为什么这些状况发生期间出现周期性的变化。由这些分析可推知该段的逻辑顺序是先报道了一个结果，然后解释了它的重要性，和B选项表达一致。12、Accordingtothepassage,whichofthefollowingfeaturesischaracteristicofanElNino?A、ColdcoastalwaternearPeru.B、Windblowingfromthewest.C、Randomoccurrence.D、Worldwideeffects.标准答案：B知识点解析：细节题。联系第二段段首对厄尔尼诺现象的解释IthaslongbeenknownthatduringanElNino，twoconditionsexist：unusuallywarmwaterextendsalongtheeasternPacific，principallyalongthecoastsofEcuadorandPeru，andwindsblowfromthewestintothewarmerairrisingoverthewarmwaterintheeast．“人们早就知道，在厄尔尼诺现象发生期间，存在两种现象——一是异常的暖流沿着太平洋东海岸延伸。尤其是沿着厄瓜多尔和秘鲁的海岸延伸．二是从西方来的季风吹进在东方暖流中产生的更暖的空气中。”可知选项B中windsblowingfromthewest“从西方来的季风”是厄尔尼诺现象的一种特征，所以答案选B。13、Whichofthefollowing,iftrue,wouldmostseriouslyunderminethevalidityofthemodelElNinothatispresentedinthepassage?A、ElNinoextendsmuchfartheralongthecoastsofEcuadorandPeruduringsomeyears.B、TherisingofcoldwaterintheeasternPacificdependsonthelocalcharacters.C、ThevariationsinthetimeforRossbywavestocrossthePacificrelyonthewindpower.D、ThePacificirregularwesterncoasthindersmostKelvinwavesfromheadingeastward.标准答案：D知识点解析：细节题。根据第二段最后一句即花费数月时间穿越太平洋后，“罗斯比波波浪”来到太平洋盆地的西部边缘——该盆地被模拟成平坦的屏障，但实际上包含很不规则的岛屿群。可知，该模式依据的是太平洋盆地的西部边缘是平坦的。而如果不是这样，则该模式就不正确。通读答案，D选项内容太平洋不规律规则的西部海岸阻碍了大多数开氏波浪流向东部和原文表述一致，所以答案选D。14、Accordingtothemodelpresentedinthepassage,whichofthefollowingnormallysignalsthedisappearanceofanElNino?A、ThearrivalintheeasternPacificofnegativesea-levelKelvinwaves.B、Ashiftinthedirectionofthewindsproducedbyananti-ElNino.C、ThereflectionofKelvinwavesreachingtheeasternborderofthePacific.D、AnincreaseinthespeedatwhichnegativeRossbywavescrossthePacific.标准答案：A知识点解析：推断题。联系原文第二、三段内容，第二段介绍了厄尔尼诺现象存在的两种现象——异常的暖流沿着太平洋东海岸延伸和从西方来的季风吹进在东方暖流中产生的更暖的空气中。第三段指出．如果从西部来的“开氏波浪”达到足够的量．它们就会克服提升海平面的反馈机制，促使该机制变成相反的寒冷模式，进而导致季风的逐渐转变。最终促使“罗斯比波浪”向西流动．寒冷的“开氏波浪”结束循环返回。开始另一个暖流循环。这说明，“开氏波浪”的返回就预示着厄尔尼诺现象的结束。和选项A的表述一致。15、Theprimarypurposeofthetextasawholeisto______.A、introduceanewexplanationofphysicalphenomenonB、explainthedifferencebetweentwonaturalphenomenaC、illustratethelimitsofapplyingmathematicstocomplexproblemsD、clarifythedistinctionbetweenanoldexplanationandanewmodel标准答案：A知识点解析：主旨题。回顾全文。第一段提到了利用数学模式对厄尔尼诺现象的发生进行的预测，接着介绍了该模式的重要性，第二、三段具体介绍了该模式的观点。这说明，本文主要是在介绍对厄尔尼诺现象的一种新解释。所以答案选A。Aidedbytherecentabilitytoanalyzesamplesofairtrappedinglaciers,scientistsnowhaveaclearerideaoftherelationshipbetweenatmosphericcompositionandglobaltemperaturechangingoverthepast160,000years.Inparticular,determinationofatmosphericcompositionduringperiodsofglacialexpansionandretreat(coolingandwarming)ispossibleusingdatafromthe2,000meterVostokicecoredrilledinAntarctica.Thetechniqueinvolvedissimilartothatusedinanalyzingcoresofmarinesediments,wheretheratioofthetwocommonisotopesofoxygen,180and160,accuratelyreflectspasttemperaturechanges.IsotopicanalysisofoxygenintheVostokcoresuggestsmeanglobaltemperaturefluctuationsofupto10degreescentigradeoverthepast160,000years.DatafromtheVostokcorealsoindicatethattheamountofcarbondioxidehasfluctuatedwithtemperatureoverthesameperiod:thehigherthetemperature,thehighertheconcentrationofcarbondioxideandthelowerthetemperature,thelowertheconcentration.Althoughchangeincarbondioxidecontentcloselyfollowschangeintemperatureduringperiodsofdeglaciation,itapparentlylagsbehindtemperatureduringperiodsofcooling.Thecorrelationofcarbondioxidewithtemperature,ofcourse,doesnotestablishwhetherchangesinatmosphericcompositioncausingthewarmingandcoolingtrendsorwerecausedbythem.ThecorrelationbetweencarbondioxideandtemperaturethroughouttheVostokrecordisconsistentandpredictable.Theabsolutetemperaturechanges,however,arefrom5to14timesgreaterthanwouldbeexpectedonthebasisofcarbondioxide'sownabilitytoabsorbinfraredradiation,orradiantheat.Thisreactionsuggeststhat,quiteasidefromchangesinheat-trappinggases,commonlyknownasgreenhousegases,certainpositivefeedbacksarealsoamplifyingthetemperaturechange.Suchfeedbacksmightinvolveiceonlandandsea,clouds,orwatervapor,whichalsoabsorbradiantheat.OtherdatafromtheVostokcoreshowthatmethanegasalsocorrelatescloselywithtemperatureandcarbondioxide.Themethaneconcentrationnearlydoubled,forexample,betweenthepeakofthepenultimateglacialperiodandthefollowinginterglacialperiod.Withinthepresentinterglacialperiodithasmorethandoubledinjustthepast300yearsandisrisingrapidly.Althoughtheconcentrationofatmosphericmethaneismorethantwoordersofmagnitudelowerthanthatofcarbondioxide,itcannotbeignored:theradiativepropertiesofmethanemakeit20timesmoreeffective,moleculeformolecule,thancarbondioxideinabsorbingradiantheat.Onthebasisofasimulationmodelthatclimatologicalresearchershavedeveloped,methaneappearstohavebeenabout25percentasimportantascarbondioxideinthewarmingthattookplaceduringthemostrecentglacialretreat8,000to10,000yearsago.16、Theprimarypurposeofthepassageisto______.A、interpretdataB、explainresearchmethodologyC、evaluateaconclusionD、suggestanewtechnique标准答案：A知识点解析：主旨题。根据文章第一、二、四段的首句Aidedbytherecentabilitytoanalyzesamplesofairtrappedinglaciers，scientistsnowhaveacleareridea…，DatafromtheVostolkcorealsoindicatethat…．OtherdatafromtheVostokcoreshowthat…可以把握文章的主要目的是科学家通过对困在冰川中的空气样品进行分析．对大气构成与全球气温变化之间的关系进行解释说明。简而言之，就是“解释数据”，和A选项表达一致。17、Accordingtothepassage,whichofthefollowingstatementsbestdescribestherelationshipbetweencarbondioxideandglobaltemperature?A、Carbondioxidelevelschangeimmediatelyinresponsetochangesintemperature.B、Carbondioxidelevelscorrelatewithglobaltemperatureduringcoolingperiodsonly.C、Duringcoolingperiods,carbondioxidelevelsinitiallyremainhighandthendecline.D、Carbondioxidelevelsincreasemorequicklythanglobaltemperaturedoes.标准答案：C知识点解析：细节题。根据“therelationshipbetweencarbondioxideandglobaltemperature”定位到文章第二段。Althoughchangeincarbondioxidecontentcloselyfollowschangeintemperatureduringperiodsofdeglaciation，itapparentlylagsbehindtemperatureduringperiodsofcooling．“尽管在冰川消退期，二氧化碳含量的变化紧随着气温的变化，但在降温期，二氧化碳含量的变化显然滞后于气温。”说明降温期二氧化碳含量先升后降，比气温下降慢一步，和选项C表述一致，所以C为正确答案。同时也排除了A“二氧化碳对气温变化做出的反应是迅速的”和B“二氧化碳含量仅在降温期和气温有关”。D“二氧化碳比气温升得更快”属于无中生有。所以答案选C。18、Theauthormentions"certainpositivefeedbacks"(Line6,Para.3)inordertoindicatethat______.A、increasedconcentrationofcarbondioxideintheEarth’satmosphereisresponsibleforglobaltemperatureincreaseB、someclimatesimulationmodelshaveproducedusefulinformationC、greenhousegasesalonedonotaccountforglobaltemperatureincreaseD、variablesthatbenefitlifearecausingglobaltemperaturetoincrease标准答案：C知识点解析：细节题。根据第三段Thisreactionsuggeststhat，quiteasidefromchangesinheat—trappinggases，commonlyknownasgreenhousegases，certainpositivefeedbacksarealsoamplifyingthetemperaturechange．Suchfeedbacksmightinvolveiceonlandandsea，clouds，orwatervapor，whichalsoabsorbradiantheat．“这种关系表明，除了捕热气体(即通常所称为的温室气体)以外，某些正反馈也会扩大温度变化。此类反馈可能涉及陆地上和海洋中的冰、云或水蒸气，它们也都会吸收辐射热。”可知不仅仅是温室气体导致了温度升高．某些正反馈也是原因之一。C选项和原文表述一致。所以答案选C。19、Accordingtothepassage,whichofthefollowingstatementsaboutmethaneistrue?A、Methaneisfoundinmarinesediments.B、Methaneismoreeffectivethancarbondioxideinabsorbingradiantheat.C、TheEarth’satmospherenowcontainsmorethantwiceasmuchmethaneasitdoescarbondioxide.D、ThehighertheconcentrationofcarbondioxideintheEarth’satmosphere,thelowertheconcentrationofmethane.标准答案：B知识点解析：细节题。根据“methane”定位到第四段。根据Althoughtheconcentrationofatmosphericmethaneismorethantwoordersofmagnitudelowerthanthatofcarbondioxide，itcannotbeignored：theradiativepropertiesofmethanemakeit20timesmoreeffective，moleculeformolecule，thancarbondioxideinabsorbingradiantheat．“尽管大气甲烷的含量要比二氧化碳的含量低两个多数量级，但它仍不能被忽视：就分子与分子相对比，甲烷的辐射特性使其在吸收辐射热这方面，要比二氧化碳强出20倍。”说明甲烷在吸收辐射热这方面比二氧化碳有效。和选项B的表述一致，所以答案是B。A“甲烷是在海洋沉积物中发现的”原文没有提及．C是对原文“甲烷的含量几乎翻了一倍。在目前的间冰期范围内，它在过去短短的300年就已经增加了两倍多，并正在迅速增长”的误解，D“二氧化碳含量越高，甲烷含量越低”也没有提及。20、ThepassagesuggeststhatwhenthemethaneconcentrationintheEarth’satmospheredecreases,whichofthefollowingalsohappens?A、Glaciersmeltfaster.B、Theconcentrationofcarbondioxideincreases.C、Carbondioxideabsorbsmoreradiantbeat.D、Theglobaltemperaturedecreases.标准答案：D知识点解析：推断题。根据文章最后一段的最后一个例子“从气候学研究者所建立的某个模拟模型来看，在8000至10000年之前的最近一次冰川稍退期间发生的升温过程中，甲烷似乎发挥了相等于二氧化碳25％的重要作用。”可知温度升高，甲烷含量升高，二者关系是正相关。那么如果甲烷含量下降，温度应该会降低．所以答案选D。大学英语六级改革适用（阅读）模拟试卷第2套一、仔细阅读(本题共20题，每题1.0分，共20分。)Iamoneofthemanycitypeoplewhoarealwayssayingthatgiventhechoiceweshouldprefertoliveinthecountryawayfromthedirtandnoiseofalargecity.Ihavemanagedtoconvincemyselfthatifitweren'tformyjobIwouldimmediatelyheadoutfortheopenspacesandgobacktonatureinsomesleepyvillageburiedinthecountry.Buthowrealisticisthedream?Citiescanbefrighteningplaces.Themajorityofthepopulationliveinmassivetowerblocks,noisy,dirtyandimpersonal.Thesenseofbelongingtoacommunitytendstodisappearwhenyoulivefifteenfloorsup.Allyoucanseefromyourwindowsissky,orotherblocksofflats.Childrenbecomeaggressiveandnervous—coopedupathomeallday,withnowheretoplay;theirmothersfeelisolatedfromtherestoftheworld.Strangelyenough,whereasinthepasttheinhabitantsofonestreetallkneweachother,nowadayspeopleonthesamefloorintowerblocksdon'tevensayhellotoeachother.Countrylife,ontheotherhand,differsfromthiskindofisolatedexistenceinthatasenseofcommunitygenerallybindstheinhabitantsofsmallvillagestogether.Peoplehavetheadvantageofknowingthatthereisalwayssomeonetoturntowhentheyneedhelp.Butcountrylifehasdisadvantagestoo.Whileitistruethatyoumaybeamongfriendsinavillage,itisalsotruethatyouarefromtheexcitingandimportanteventsthattakeplaceincities.There'slittlepossibilityofgoingtoanewshoworthelatestmovie.Shoppingbecomesamajorproblem,andforanythingslightlyoutoftheordinaryyouhavetogoonanexpeditiontothenearestlargetown.Thecity-dwellerwholeavesforthecountryisoftenoppressedbyasenseofunbearablestillnessandquiet.What,then,istheanswer?Thecountryhastheadvantageofpeaceandquiet,butsuffersfromthedisadvantageofbeingcutoff;thecitybreedsafeelingofisolation,andconstantnoisebattersthesenses.Butoneofitsmainadvantagesisthatyouareatthecentreofthings;andthatlifedoesn'tcometoanendathalfpastnineatnight.Somepeoplehavefound(orratherbought)acompromisebetweenthetwo:theyhaveexpressedtheirpreferenceforthe"quietlife"byleavingthesuburbsandmovingtovillageswithincommutingdistanceoflargecities.Theygenerallyhaveaboutasmuchsensitivityastheplasticflowerstheyleavebehind—theyarepollutedwithstrangeideasaboutchangeandimprovementwhichtheyforceontotheunwillingoriginalinhabitantsofthevillages.1、Whatisthemainideaofthefirstparagraph?A、Largecitiesaredirtyandnoisy.B、Ajobisveryimportantfor"me".C、Manycitypeopleprefervillagetocity.D、Villagesaretidyandpeaceful.标准答案：C知识点解析：主旨题。文章开头讲到，“许多市民说，给他们一个机会他们宁愿住在乡下．远离肮脏而又嘈杂的大城市”，接着讲到作者自己也这样认为，因此，第一段主要内容是与城市相比。很多市民更喜欢乡下。C项符合题意。2、Accordingtotheauthor,whyarecitiesfrightening?A、Becausethepressureofworkmaymakepeoplesuffer.B、Becausemanyblocksincityaredirty,noisyandimpersonal.C、Becauseit’shardtofindagoodjobincity.D、Becauselivinginacityisnotsafe.标准答案：B知识点解析：细节题。根据题目中的“citiesfrightening”可定位至第二段前两句“Citiescanbefrighteningplaces．Themajorityofthepopulationliveinmassivetowerblocks，noisy，dirtyandimpersonal．”由此可知，作者认为城市可怕是因为城市嘈杂、肮脏而又没有人情味。其它选项内容文章均未提到。3、Whichofthefollowingisnotthedisadvantageofcountrylife?A、Itisinconvenienttobuysomething.B、Villagerscan’tenjoytheexcitingevents.C、Villagershavelittleopportunitytoseeafilm.D、Therearemanyfriendsaroundeachvillager.标准答案：D知识点解析：细节题。根据题干中的“thedisadvantageofcountrylife”可定位至第三段，第三段提到“itisalsotruethatyouarefromtheexcitingandimportanteventsthattakeplaceincities．There’slittlepossibilityofgoingtoanewshoworthelatestmovie．Shoppingbecomesamajorproblem”，A、B、C三项均符合文意，根据第三段第四句“Whileitistruethatyoumaybeamongfriendsinavillage，itisalsotruethat…”可知，生活在大帮朋友间并非缺点。4、Whatdoesthelastsentenceofthispassagemean?A、Citypeoplewanttochangecountrylife.B、Citypeoplewanttocombinetheadvantagesofcityandvillage.C、Villagesdon’twelcomecitypeople.D、Citypeopledon’tconcernthefeelingofvillagers.标准答案：B知识点解析：推断题。文章最后一句意为“他们被有关改善和改变的奇怪思想影响了，而这些思想是他们强加给村里不愿改变的原始居民的。”文章最后一段讲到，乡村生活和城市生活各有优点，有些人在乡下和城市间找到了折中的办法，也就是将两种优点结合起来，而将城市的优点带到乡下，对于村民来说是强加于他们身上的。故此句意味着市民想要将城市的优点和乡村的优点结合起来，B项符合。5、Thebesttitleofthepassagemaybe______.A、CountryLifeHasManyAdvantagesB、CityPeoplePreferVillagetoCityC、CountryLifeandCityLifeD、CityLifeisBetterThanCountryLife标准答案：C知识点解析：主旨题。本文将城市生活和乡村生活进行了对比，二者各有优缺点，城市肮脏、嘈杂、没有人情味，但每个人都是世界的中心，而乡村生活虽然安静、人情味浓郁，但购物不便，也无法享受大城市的一些激动人心的重要的活动。选项中，C项“乡村与城市生活”最能概述文章大意，故选择C。Massivechangesinalloftheworld'sdeeplycherishedsportinghabitsareunderway.Whetherit'soneofLondon'sparksfullofpeopleplayingsoftball,andRussianstakinguprugby,ortheSuperbowlrivallingtheFootballCupfinalasatelevisedspectatoreventinBritain,thepatternsofplayersandspectatorsarechangingbeyondrecognition.Wearewitnessaglobalizationofoursportingculture.Thatannualbicyclerace,theTourdeFrance,muchlovedbytheFrenchisagoodcaseinpoint.JustafewyearsbackitwasastrictlycontinentalaffairwithFranceBelgiumandHolland,SpainandItalytakingpart.ButinrecentyearsithasbeendominatedbyColombianmountainclimbers,andAmeri