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六级阅读练习试题1/46一、阅读理解(共20题，合计100分)Unit1PassageOneCarbondioxidemakesuplessthanonepercentoftheEarth'satmosphere,butthegasisveryimportanttolifeonEarth.Scientistsarefindingthatprocessesinvolvingcarbondioxideaffectourclimateinwaysthataredifficulttounderstand.Lastmonth,acommitteeoftheNationalAcademyofSciencesinWashingtonreleasedareport.Itconfirmedthatworldtemperaturesincreasedaboutsix-tenthsofadegreeCelsiusinthelastonehundredyears.Thereportalsoconfirmedevidencethatthelevelofcarbondioxideisincreasing.ThebestinformationaboutclimateinthepastcomesfromtestsoficemanykilometersdeepinAntarcticaandGreenland.Thetestsshowchangesintemperatureduringthepastfourhundredthousandyears.Thesetestsshowthatlevelsofcarbondioxidetodayarethehighestevermeasured.Thesefindingshaveledscientiststobelievethatcarbondioxideisamajorcauseofclimatewarming.Carbondioxideisreleasedintotheatmospherewhenfuelisburned.Oil,coalandwoodareallfuelsthatreleasethegas.Whenbiologicalwastebreaksdown,italsoreleasescarbondioxide.However,plantsusecarbondioxideintheprocesscalledphotosynthesis.ThisprocessprovidesfoodforalmostalllifeonEarth.Somegroupsthatsupportburningoilandcoalwanttoincreasetheamountofcarbondioxideintheatmosphere.Theyopposeinternationaleffortstocontrolcarbondioxide.Somescientistsbelievethatforestsandtreesareabletocapturelargeamountsofcarbondioxidefromtheair.Somegroupsevensuggestthatanincreaseincarbondioxidecouldcauseplantstogrowfaster.ArecentstudyinNorthCarolinafoundthatmorecarbondioxideintheaircouldcausetreestogrowfaster.Buttheresearchersfoundtheeffectappearstolastforonlythreeyears.Anotherstudyshowedthatmuchofthecarbondioxidethatistakeninbytreesisreleasedwithinthreeyears.Thestudynotedthatleavesreleasecarbondioxidewhentheyfallfromtreesandbreakdowninthesoil.Plantsalsonaturallyreleasecarbondioxidethroughtheprocessofrespiration.Thenaturalbalanceofgasesintheatmosphereisacomplexscientificissue.Thedebateovercarbondioxideisonlyonepartofeffortstounderstandworldclimatechange.1ThecommitteereportoftheNationalAcademyofSciencesinWashingtonrevealsthat______.A.icefromAntarcticaandGreenlandisappropriatetoshowthechangeB.carbondioxideisreleasedmainlyfromthefuelC.globaltemperaturesincreaseasthelevelofcarbondioxideincreasesD.carbondioxideishelpfulfortreegrowth[正确答案]C[您的答案]C本题分值：1分您的得分：1分试题解析:推断题。文章第一段指出，位于华盛顿的国家科学院的一个委员会发表了一份报告，该报告证实了全球温度在过去一百年升高了六分之一摄氏度，还证实发了二氧化碳含量正在增高，由此推断，报告显示二氧化碳含量和全球温度都有所升高，所以C正确。+我要找茬+加入错题+收藏该题评论此题2Whichofthefollowingcanbethesourceofcarbondioxide?六级阅读练习试题2/46A.Oilandsoil.B.Soilandtrees.C.Woodandsoil.D.Treesandoil.[正确答案]D[您的答案]A本题分值：1分您的得分：0分试题解析:细节题。文章第三段第三句提到，石油、煤和木材都是能释放二氧化碳的燃料；倒数第二段最后两句提到，树叶从树上落下来的时候会释放二氧化碳，植物在呼吸过程中也会自然地释放二氧化碳，再结合常识可知，土壤无法产生二氧化碳，所以排除A、B、C，选D。+我要找茬+加入错题+收藏该题评论此题3Accordingtothispassage,somepeopledisagreewiththecontrolofcarbondioxidebecause______.A.theythinkthatcarbondioxideisbeneficialforplantgrowthB.theywanttousemorefuelsthatcanemitcarbondioxideC.theythinkcarbondioxideisnotthemainreasonforglobalwarmingD.theythinkitwilldestroythenaturalbalanceofgasesintheworld[正确答案]B[您的答案]A本题分值：1分您的得分：0分试题解析:推断题。文章第匹l段第三句指出，一些支持燃烧石油和煤的组织想要增加大气中二氧化碳的含量，他们反对国际上为控制二氧化碳所做的努力，由此推断，他们反对控制二氧化碳的原因是他们想更多地使用那些可能释放二氧化碳的燃料，所以B正确。由第五段第二句可知，一些组织甚至认为二氧化碳的增加会促进植物生长，但这并非他们反对控制二氧化碳的原因，故排除干扰项A。+我要找茬+加入错题+收藏该题评论此题4ThosestudiescarriedoutinNorthCarolinasuggestthat______.A.trees'functionforabsorbingcarbondioxideislimitedB.carbondioxideisthemaincauseforglobalwarmingC.leavesfallingfromtreescanemitmoreoxygenD.carbondioxideisbeneficialfortrees'growthformanydecades[正确答案]A[您的答案]A本题分值：1分您的得分：1分试题解析:推断题。文章倒数第二段指出，最近在北卡罗来纳州进行的一项研究发现，空气中二氧化碳的增多能促进树木加速生长，但研究人员还发现这种功效只能持续三年，由此推断，尽管树木可以吸收二氧化碳，但这种吸收功能是有限的，所以A正确。+我要找茬+加入错题+收藏该题评论此题5Thewordissue(Line1,Para.7)canbereplacedby______.A.organB.topic六级阅读练习试题3/46C.publicationD.result[正确答案]B[您的答案]B本题分值：1分您的得分：1分试题解析:语义题。被考查词所在句意为“大气中气体的自然平衡是一个复杂的科学______”，再结合之后提到的关于二氧化碳的争论可知，气体的自然平衡应该是一个科学论题，所以B正确。A(器官)、C(出版物)、D(结果)均不符合句意。+我要找茬+加入错题+收藏该题评论此题PassageTwoThehigh-techrevolutionhasinspiredaseeminglyendlessstreamofnewandexcitingelectronicproductsthatwejustcan'tlivewithout.Infact,thedizzyingspeedoftechnologicalinnovationcanmakelastyear'smustthisyear'sjunk.Andthat'stheproblem.Theaveragelifespanatpersonalcomputerhasshrunktoaround19months--andthishasnothingtodowithworn-outmiceordamageddiskdrives.Simplyput,electronicproductscanbecomeobsoletebeforeyou'veevenfiguredouthowtheywork.Sowhathappenstoallthoseoldkeyboards,monitors,organizersandCPUs?Mostarestashedawayintheatticorforgotteninacorporatewarehouse,takingupvaluablespace.Butmanyendupinlandfills,andthatiswherethetroublereallybegins.Computermonitorscancontainupto3.5kgofleadandcanactuallybeconsideredhazardouswasteoncetheyarenolongerinuse.Circuitboardsinelectronicproductscontaincadmium(镉),chromium(铬)andmercury,allofwhicharetoxicsubstancesthatcanleachintogroundwaterifleftinalandfill.Unfortunately,thisdisposalproblemisnotgoingtodisappearanytimesoon--infact,itisgrowingbytheminute.InJapanalone,consumersthrowawaysome20millionTVs,washingmachines,refrigeratorsandairconditionerseachyear.InEurope,6millionmetrictonsofelect