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1、Unit8FocusonGlobalWarmingKeytotheExercisesTextcomprehensionI.AII.1.T;2.T;3.F;4.F;5.F.III.1.Paragraph2.Becauseglobalwarmingmaybethesinglelargestthreattoourplanet（theearth）.Low-lyingnationscouldbeawashinseawater,rainanddroughtpatternsacrosstheworldcouldchange,hurricanescouldbecomemoref
2、requent,andElNinoscouldbecomemoreintense.2.Paragraph3.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutcarbondioxide,producemethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmethane-belchingcattle,andreleasenitrogenoxidebyusingnitrogen-basedfertilize
3、rs.3.Paragraph4.TheincreasedconcentrationsofgreenhousegasespreventadditionalthermalradiationfromleavingtheEarth,socausetheglobalwarming.4.Paragraph7.Aslightincreaseinheatandraininequatorialregionswouldincreasevector-bornediseasessuchasmalaria;moreintenserainsandhurricanescouldcausemo
4、reseverefloodingandmoredeathsincoastalregionsandalongriverbeds;evenamoderateriseinsealevelcouldthreatenthelow-lyingislands;hottersummerscouldleadtomorecasesofheatstroke,hospitaladmissionsanddeathsamongvulnerablepeoplewithheartproblemsorrespiratoryproblems.5.Paragraph8and10.Wecancurbo
5、urconsumptionoffossilfuelsandusetechnologiestoreducetheemissionofheat-trappinggaseslikecarbondioxide,methane,andnitrousoxides,andprotecttheforestsintheworld,andwecanalsoadvocatepoliciesthatwillcombatglobalwarmingoverthelongterm,thingslikecleancars,environmentallyresponsiblerenewablee
6、nergytechnologies,andstoppingtheclear-cuttingofvaluableforests.IV.1.GlobalwarmingwillprobablybethemostseriousthreattoourEarth,ifwedonottakeintoaccountofsomeotherpossibledisasters,suchasanotherworldwar,collisionofourEarthwithsomesmallorbitingplanet,orspreadofincurablediseases.2.Interm
7、sofhumanhealth,thepeopleofthepoorercountrieswillsuffermost,becausetheircountriesdonothavemoneytoprotectthemwhenclimatechanges.StructuralanalysisSub-ideasinthesecondpart:1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and4)2)theeffectofsuchconcentrationo
8、nclimatechan
