新课标考点规范练选修6Unit4

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1、丛挙主・考点规范练29（选修6Unit4）I」阅读理解1.（2014-河北保定调研）"Plantswereexpectedtogetlargerwithincreasedcarbondioxideintheatmosphere,butchangesintemperature,humidity（湿度）andnutrientavailabilityseemtohavetrumpedthebenefitsofincreasedcarbondioxide/5saidresearchersfromtheNationalUniversityofSingapo

2、re.45percentofthespeciesstudiednowreachsmalleradultsizesthantheydidinthepast.Theresearcherspointedoutthatwarmertemperaturesandchanginghabitats,causedbyclimatechange,arepossiblereasonsfortheshrinkingofcreatures-"Wedonotyetknowtheexactmechanisms（机制）involved,orwhysomeorganismsar

3、egettingsmallerwhileothersareunaffected,vtheresearcherssaid/'Untilweunderstandmore,wecouldberiskingnegativeconsequencesthatwecan^tyetquantify/*Thechangeisbigincold-bloodedanimals.Onlytwodecadesofwarmertemperaturesareenoughtomakecreaturessmaller.Anincreasesofonly1°Ccausesnearl

4、ya10percentincreaseinmetabolism（新陈代谒寸）.Greateruseofenergyresultsintinytortoisesandlittlelizards-Fisharesmallernowtoo.Thoughoverfishinghasplayedapartinreducingnumbers,experimentsshowthatwarmertemperaturesalsostopfishgrowing.Warm-bloodedanimalsaren'timmune（免除）!Yomthesizechangec

5、ausedbyclimatechange.Manybirdsarenowsmaller.Reddeerareweaker.Andpolarbearsaresmaller,comparedwithhistoricalrecords・Thisisn'tthefirsttimethathashappenedinEarthshistory.55millionyearsago,awarmingeventsimilartothecurrentclimatechangecausedbees,spidersandantstoshrinkby50to75perce

6、ntoverseveralthousandyears.Thateventhappenedoveralongertimethanthecurrentclimatechange.Thespeedofmodernclimatechangecouldmeanorganismsmaynotrespondoradaptquicklyenough,especiallythosewithlonggenerationtimes.So,itislikelythatmorenegativeinfluencesofclimatechangewillbeshowninth

7、efuture.Whatdoesthetextmainlytalkabout?A.Whysomespeciesbecomesmaller.B.HowclimatechangesinEarth'shistory.C.Climatechangehasmanynegativeeffects.D.Speciesarebecomingsmallerastheclimategetswarmer.2.TheunderlinedwordUtrumped^inParagraph1probablymeans“tA.beatenB.gainedC.destroyedD

8、.lost3.ResearchersfromtheNationalUniversityofSingaporebelievethat.A.