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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,hurricanescouldbecom
2、emorefrequent,andElNinoscouldbecomemoreintense.2.Paragraph3.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutcarbondioxide,producemethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmethane-belchingcattle,andreleasenitrogenoxideb
3、yusingnitrogen-basedfertilizers.3.Paragraph4.TheincreasedconcentrationsofgreenhousegasespreventadditionalthermalradiationfromleavingtheEarth,socausetheglobalwarming.4.Paragraph7.Aslightincreaseinheatandraininequatorialregionswouldincreasevector-borne带菌媒介引起的dise
4、asessuchasmalaria;moreintenserainsandhurricanescouldcausemoreseverefloodingandmoredeathsincoastalregionsandalongriverbeds;evenamoderateriseinsealevelcouldthreatenthelow-lyingislands;hottersummerscouldleadtomorecasesofheatstroke,hospitaladmissionsanddeathsamongv
5、ulnerablepeoplewithheartproblemsorrespiratoryproblems.5.Paragraph8and10.Wecancurbourconsumptionoffossilfuelsandusetechnologiestoreducetheemissionofheat-trappinggaseslikecarbon二氧化碳dioxide,methane,andnitrousoxides,andprotecttheforestsintheworld,andwecanalsoadvoca
6、tepoliciesthatwillcombatglobalwarmingoverthelongterm,thingslikecleancars,environmentallyresponsiblerenewableenergytechnologies,andstoppingtheclear-cuttingofvaluableforests.IV.1.GlobalwarmingwillprobablybethemostseriousthreattoourEarth,ifwedonottakeintoaccountof
7、someotherpossibledisasters,suchasanotherworldwar,collisionofourEarthwithsomesmallorbitingplanet,orspreadofincurablediseases.2.Intermsofhumanhealth,thepeopleofthepoorercountrieswillsuffermost,becausetheircountriesdonothavemoneytoprotectthemwhenclimatechanges.Str
8、ucturalanalysisSub-ideasinthesecondpart.1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and4)2)theeffectofsuchconcentrationonclimatechange(Par
