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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,hurricanescouldbecomemorefreq
2、uent,andElNinoscouldbecomemoreintense.2.Paragraph3.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutcarbondioxide,producemethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmethane-belchingcattle,andreleasenitrogenoxidebyusingnitrogen-basedfertilizers.3.P
3、aragraph4.TheincreasedconcentrationsofgreenhousegasespreventadditionalthermalradiationfromleavingtheEarth,socausetheglobalwarming.4.Paragraph7.Aslightincreaseinheatandraininequatorialregionswouldincreasevector-bornediseasessuchasmalaria;moreintenserainsandhurricanescouldcausemoreseveref
4、loodingandmoredeathsincoastalregionsandalongriverbeds;evenamoderateriseinsealevelcouldthreatenthelow-lyingislands;hottersummerscouldleadtomorecasesofheatstroke,hospitaladmissionsanddeathsamongvulnerablepeoplewithheartproblemsorrespiratoryproblems.5.Paragraph8and10.Wecancurbourconsumptio
5、noffossilfuelsandusetechnologiestoreducetheemissionofheat-trappinggaseslikecarbondioxide,methane,andnitrousoxides,andprotecttheforestsintheworld,andwecanalsoadvocatepoliciesthatwillcombatglobalwarmingoverthelongterm,thingslikecleancars,environmentallyresponsiblerenewableenergytechnologi
6、es,andstoppingtheclear-cuttingofvaluableforests.IV.1.GlobalwarmingwillprobablybethemostseriousthreattoourEarth,ifwedonottakeintoaccountofsomeotherpossibledisasters,suchasanotherworldwar,collisionofourEarthwithsomesmallorbitingplanet,orspreadofincurablediseases.2.Intermsofhumanhealth,the
7、peopleofthepoorercountrieswillsuffermost,becausetheircountriesdonothavemoneytoprotectthemwhenclimatechanges.StructuralanalysisSub-ideasinthesecondpart:1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and4)2)theeffectofsuchconcentrationonclimatechan
