2013届高考英语一轮复习课时知能训练 Unit 2 Cloning 新人教版选修8.doc

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1、课时知能训练Ⅰ.阅读理解(2012·广东潮州月考)TheholeintheEarth'sozonelayer(臭氧层)hasuntilnowprotectedAntarcticafromtheworsteffectsofglobalwarming.Butscientistshavewarnedthatastheholeclosesupinthenextfewdecades，temperaturesonthecontinentcouldrisebyaround3℃onaverage，withmeltingicecontributingtoaglobalsealeveli

2、ncreaseofupto1.4metres.InthepastdecadesthewesternAntarctichasseenrapidicelossastheworldhaswarmed，buttheotherpartsofthecontinenthave，paradoxically，beencooling，resultingina10%increaseiniceintheseasaroundtheregion.ThisisbecausetheholeintheozonelayerhasincreasedcoldwindsinAntarctica，makingm

3、uchofthecontinentsurfacecolderthanusual.Butnowthatthegassesthatcausetheozoneholehavebeenbanned，scientistsexpecttheholetorepairitselfwithinthenext50to60years.BythenthecoolingeffectwillhavefadedoutandtheAntarcticwillfacethefullimpactofglobalwarming.Thismeansanincreaseinaverageairtemperatu

4、resofaround3℃andareductioninseaicebyaroundathird.Thebiggestthreattothecontinentcomesfromwarmingseas.RobertJohnson，ascientistwhomonitorsAntarcticaicesheets，said，“TheicesheetsinAntarcticaarehundredsofmetresthick.Butoncewarmoceanwatersstartflowingunderneath，theicewillbeginthinningandcouldb

5、reakupveryquickly.”Thinningicesheetscauseicetobreakawayfromthecontinentandtomeltevenfaster.EscapingicefromwesternAntarcticahasalreadyresultedina10%riseinglobalsealevelinrecentdecades.Johnsonbelievesthatinternationalactiontoreduceglobalwarmingisrequiredimmediatelyoritmaybetoolate.“Everyt

6、hingisconnected—AntarcticamaybealongwayawaybutitisanimportantpartoftheEarth'ssystem，”saidJohnson.“Itcontains90%oftheworld'sice,70%oftheworld'sfreshwaterandthatisenough，ifitmeltscompletely，toraisesealevelsby63metres.”Eveninaworsecasesituationscientistsdon'texpecttheicetoentirelydisappear

7、，butpredictthat，becauseofthemeltingicesheets，averagesealevelrisewillbearound1.4metreshigherbytheendofthecentury.【语篇解读】　本文主要描述了由于臭氧层的破坏，南极洲冰层正处于加速融化的危险中。科学家认为南极冰层不会完全消失，但海平面会随着冰层的融化而上升。1．Theunderlinedword“paradoxically”(inParagraph2)mostprobablymeans“________”．A．rapidly　　　　　　B．a