选修6 Unit 4 Global warmingke课文填空

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1、选修6Unit4Globalwarming-ReadingTHEEARTHISBECOMINGWARMER-BUTDOESITMATTER?Duringthe20thcenturythetemperatureoftheearthroseaboutonedegreeFahrenheit.Thatprobablydoesnotseemmuchtoyouorme,butitisarapidincrease_______________othernaturalchanges.So_____________________anddoesitmatter

2、?EarthCare’sSophieArmstrongexploresthesequestions.____________________theearthisbecomingwarmer(seeGraph1)andthat____________________________thisglobalwarming____________________________________________________.Allscientists___________theviewthattheincreaseintheearth'stemper

3、atureis_________theburningoffossilfuelslikecoal,naturalgasandoiltoproduceenergy.Somebyproductsofthisprocessarecalled"greenhouse"gases,______________________________iscarbondioxide.DrJaniceFosterexplains:"Thereisa_________________thatscientistscallthe'greenhouseeffect'.Thisi

4、swhen_________________gasesintheatmosphere,likecarbondioxide,methaneandwatervapour,trapheatfromthesunand___________warmtheearth.Withoutthe'greenhouseeffect',theearthwouldbeaboutthirty-threedegreesCelsiuscoolerthanitis.So,weneedthosegases.Theproblembeginswhenweaddhuge_______

5、______extracarbondioxideintotheatmosphere.Itmeansthatmoreheatenergy___________________intheatmosphere__________theglobaltemperatureto_________."Weknowthatthelevelsofcarbondioxide___________________overthelast100to150years.ItwasascientistcalledCharlesKeeling,who_____________

6、____________oftheamountofcarbondioxideintheatmospherefrom1957to1997.Hefoundthatbetweentheseyearsthecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion(seeGraph2).Allscientistsacceptthisdata.Theyalsoagreethatitistheburningofmoreandmorefossilfuelsth

7、at______________thisincreaseincarbondioxide.Sohowhighwillthetemperatureincreasego?DrJaniceFostersaysthatoverthenext100yearstheamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.However,theattitudeofscientiststowardsthisriseiscompletelydifferent._

8、________________,DrFosterthinksthatthe________whichincreasesthetemperatureby5degre