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1、Unit8FocusonGlobalWarmingTextcomprehensionI.AII.1.T;2.T;3.F;4.F;5.F.III.1.Paragraph2.Becauseglobalwarmingmaybethesinglelargestthreattoourplanet（theearth）.Low-lyingnationscouldbeawashinseawater,rainanddroughtpatternsacrosstheworldcouldchange,hurricanescouldbecomemorefrequent,an
2、dElNinoscouldbecomemoreintense.2.Paragraph3.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutcarbondioxide,producemethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmethane-belchingcattle,andreleasenitrogenoxidebyusingnitrogen-basedfertilizers.
3、3.Paragraph4.TheincreasedconcentrationsofgreenhousegasespreventadditionalthermalradiationfromleavingtheEarth,socausetheglobalwarming.4.Paragraph7.Aslightincreaseinheatandraininequatorialregionswouldincreasevector-borne带菌媒介引起的diseasessuchasmalaria;moreintenserainsandhurricanesc
4、ouldcausemoreseverefloodingandmoredeathsincoastalregionsandalongriverbeds;evenamoderateriseinsealevelcouldthreatenthelow-lyingislands;hottersummerscouldleadtomorecasesofheatstroke,hospitaladmissionsanddeathsamongvulnerablepeoplewithheartproblemsorrespiratoryproblems.5.Paragrap
5、h8and10.Wecancurbourconsumptionoffossilfuelsandusetechnologiestoreducetheemissionofheat-trappinggaseslikecarbon二氧化碳dioxide,methane,andnitrousoxides,andprotecttheforestsintheworld,andwecanalsoadvocatepoliciesthatwillcombatglobalwarmingoverthelongterm,thingslikecleancars,environ
6、mentallyresponsiblerenewableenergytechnologies,andstoppingtheclear-cuttingofvaluableforests.IV.1.GlobalwarmingwillprobablybethemostseriousthreattoourEarth,ifwedonottakeintoaccountofsomeotherpossibledisasters,suchasanotherworldwar,collisionofourEarthwithsomesmallorbitingplanet,
7、orspreadofincurablediseases.2.Intermsofhumanhealth,thepeopleofthepoorercountrieswillsuffermost,becausetheircountriesdonothavemoneytoprotectthemwhenclimatechanges.StructuralanalysisSub-ideasinthesecondpart.1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Para
8、graphs3and4)2)theeffectofsuchconcentrationonclimatechange(Par
