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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,andElNi
2、noscouldbecomemoreintense. 2.Paragraph3.Ourfactories,powerplants,andcarsburncoalandgasolineandspitoutcarbondioxide,producemethanebyallowingourtrashtodecomposeinlandfillsandbybreedinglargeherdsofmethane-belchingcattle,andreleasenitrogenoxidebyusingnitrogen-basedfertilizers. 3.Paragraph4.The
3、increasedconcentrationsofgreenhousegases prevent additionalthermalradiation from leavingtheEarth,socausetheglobalwarming. 4.Paragraph7.Aslightincrease in heatandraininequatorialregionswouldincreasevector-borne带菌媒介引起的diseasessuchasmalaria;moreintenserainsandhurricanescouldcausemoresevereflo
4、odingandmoredeathsincoastalregionsandalongriverbeds;evenamoderateriseinsealevelcouldthreatenthe low-lyingislands;hottersummerscouldleadto morecasesofheatstroke,hospitaladmissionsanddeathsamongvulnerablepeoplewithheartproblemsorrespiratoryproblems. 5.Paragraph8and10.Wecan curb ourconsumptio
5、noffossilfuelsandusetechnologiestoreducetheemissionofheat-trappinggaseslike carbon二氧化碳 dioxide,methane,and nitrousoxides,andprotecttheforestsintheworld,andwecanalsoadvocatepoliciesthatwillcombatglobalwarmingoverthelongterm,thingslikecleancars, environmentallyresponsible renewableenergytech
6、nologies,andstoppingthe clear-cutting ofvaluableforests. IV.1.GlobalwarmingwillprobablybethemostseriousthreattoourEarth,ifwedonottakeintoaccountofsomeotherpossibledisasters,suchasanotherworldwar,collisionofourEarthwithsomesmallorbitingplanet,orspreadofincurablediseases. 2.Intermsofhumanhea
7、lth,thepeopleofthepoorercountrieswillsuffermost,becausetheircountriesdonothavemoneytoprotectthemwhenclimatechanges. StructuralanalysisSub-ideasinthesecondpart.1)the causes oftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and4)2)the effect of
