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1、二十四 选择性必修 第一册Unit6Nurturingnature(限时35分钟)Ⅰ.阅读理解AIt’sshockingthatcountlessspeciesbecomeextincteveryyearandsuchextinctionmeansforever.Tochangethesituation,scientistsarenowontheirwaytobringingbackextinctspecies.DNAisthechemicalthatcarriesthestructureofalivingthing,whichisneed
2、edbyresearcherstobringbackaspecies.DinosaurshavebeengonetoolongforanyoftheirDNAtoremaininfossils.HoweveritseemspossibletobringbackmorerecentlyextinctspeciessuchasIceAgeanimal,thewoollymammoth.In2015,ateamofSpanishandFrenchscientistsre-createdthePyreneanibex,whichhadgoneext
3、inctthreeyearsearlier.Thenewanimaldidn’tsurvivelong,butscientificadvancesshouldimprovethesuccessrate.InJanuary,Australianscientistsannouncedthattheyweretryingtorestorethebroodingfrog.Thatwecanbringspeciesbackdoesn’tmeanthatweshould.Theremaybebenefitstobringbackaspecies.But
4、there’snowaytoknowhowitwillturnout.Forexample,wouldapassengerpigeonfitintoitsoldhabitat?Ormightitcrowdoutexistingspecies?Environmentalistsworrythatourabilitytobringspeciesbackmightcutdownsupportforthehardworkoftraditionalconservation.Whybothertopreserveawildlifehabitatorfi
5、ghtpoachers(偷猎者)ifweknowwecanmakeupforourmistakes?Butthoseextinctionsareourmistakestocorrect.AsenvironmentalistStewartBrandputit,“Humanshavetheabilitytorepairsomeofthatdamage.”WewoulddowelltorememberthelessonofJurassicPark:Continuewithcaution.【文章大意】本文讲述的是灭绝物种的回归。令人震惊的是,每年都
6、有无数的物种灭绝,而这样的灭绝意味着是永久性的。为了改变这种情况,科学家们现在正着手让灭绝的物种回归。1.WhatcanweknowfromPara.2?A.Scientistshavesuccessfullybroughtbacksomedinosaurs.B.It’slikelyforscientiststobringbackrecentlyextinctanimals.C.ScientistshavediscoveredDNAofallIceAgespeciesinfossils.D.IceAgeanimalslivelongerth
7、anbeforeafterbeingbroughtbacktolife.【解析】选B。推理判断题。根据第二段中“HoweveritseemspossibletobringbackmorerecentlyextinctspeciessuchasIceAgeanimal,thewoollymammoth(然而,似乎有可能使最近灭绝的物种重新出现,比如冰河时代的猛犸象。)”可知,科学家很可能会把最近灭绝的动物带回来。故选B。2.Paragraph3mainlyshowsthatbringingbackextinctspeciesis_______
8、.A.harmfulB.realisticC.helpfulD.double-edged【解析】选D。段落大意题。根据第三段整段内容可知,把灭绝的物种带回地球是一把双刃剑。故选D
