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，withmeltingicecontributingtoaglobalsealevelincreaseofupto1.4metres.InthepastdecadesthewesternAntarctichasseenrapidicelossastheworldhaswarmed，buttheotherpartsofthecontinenthave，paradoxically，beencooling，resultingina10%increaseiniceintheseasaroundtheregion.ThisisbecausetheholeintheozonelayerhasincreasedcoldwindsinAntarctica，makingmuchofthecontinentsurfacecolderthanusual.Butnowthatthegassesthatcausetheozoneholehavebeenbanned，scientistsexpecttheholetorepairitselfwithinthenext50to60years.BythenthecoolingeffectwillhavefadedoutandtheAntarcticwillfacethefullimpactofglobalwarming.Thismeansanincreaseinaverageairtemperaturesofaround3℃andareductioninseaicebyaroundathird.Thebiggestthreattothecontinentcomesfromwarmingseas.RobertJohnson，ascientistwhomonitorsAntarcticaicesheets，said，“TheicesheetsinAntarcticaarehundredsofmetresthick.Butoncewarmoceanwatersstartflowingunderneath，theicewillbeginthinningandcouldbreakupveryquickly.”Thinningicesheetscauseicetobreakawayfromthecontinentandtomeltevenfaster.EscapingicefromwesternAntarcticahasalreadyresultedina10%riseinglobalsealevelinrecentdecades.Johnsonbelievesthatinternationalactiontoreduceglobalwarmingisrequiredimmediatelyoritmaybetoolate.“Everythingisconnected—AntarcticamaybealongwayawaybutitisanimportantpartoftheEarth'ssystem，”saidJohnson.“Itcontains90%oftheworld'sice,70%oftheworld'sfreshwaterandthatisenough，ifitmeltscompletely，toraisesealevelsby63metres.”Eveninaworsecasesituationscientistsdon'texpecttheicetoentirelydisappear，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．rapidlyB．approximatelyC．contradictorilyD．apparently【解析】词义猜测题。首先，选项词义要牢记；其次，划线词所在句中的but为推断关键，划线词应理解为相反地。【答案】C2．WhatistheeffectoftheholeintheozonelayeronAntarctica?A．Itismakingmuchofthecontinentcolder.B．Itiscausingtheicetomeltfaster.C．Itismakingtheeffectsofglobalwarmingintheregionworse.D．ItisreducingtheamountofwaterinAntarctica.【解析】细节理解题。从第二段最后一句“ThisisbecausetheholeintheozonelayerhasincreasedcoldwindsinAntarctica，makingmuchofthecontinentsurfacecolderthanusual.”可以得出答案。【答案】A3．WhatdoscientiststhinkisthebiggestdangerfacingAntarctica?A．Risingsealevels.B．Warmingseawatertemperature.C．Waterpollution.D．Growingicesheets.【解析】细节理解题。从第四段第一句“Thebiggestthreattothecontinentcomesfromwarmingseas.”可得出答案。Thebiggestthreat对应thebiggestdanger。【答案】B4．WhichofthefollowingisTRUEaccordingtothepassage?A．Antarcticacontainsmostoftheworld'sfreshwater.B．Theaveragetemperaturehasincreasedby3degreecentigradeinrecentdecades.用心爱心专心1C．Antarcticaiscurrentlyexperiencingthefulleffectsofglobalwarming.D．TenpercentofAntarctica'sicehasalreadybeenlost.【解析】细节理解题。(或通过常识亦可判断)，从第五段最后一句“I...
