选修6unit4公开课

Unit4GlobalWarmingTheEarthisBecomingWarmer--ButDoesItMatter?地球在变暖——要不要紧？ReadingNewWordsandexpressionstemperature温度onedegreeFahrenheit华氏一度explore探索humanactivities人类活动phenomenon现象subscribeto同意，赞成fossilfuels矿物燃料byproduct副产品“greenhouse”gases温室气体atmosphere大气methane甲烷，沼气degreeCelsius摄氏度quantitiesof大量的accuratemeasurements精确的测量data资料，数据catastrophe大灾难beopposedto反对environmentalconsequences环境影响agreatrangeof大量的evenif即使keepon继续SkimmingSkimthetitle:THEEARTHISBECOMINGWARMER–BUTDOESITMATTER?Whatisthemaintopic?A.Theearth.B.Globalwarming.C.Becomingwarmerdoesn’tmatter.Thestructureofthearticle:IntroductionAtitleBodyConclusionSkimthebodypart(7paras):Para.1Para.2-3IIIPara.4-6IIIPara.7IVIntroductionBodyConclusionMatchthemainideaofeachpart:•Explainhowglobalwarmingcomesabout.•Twodifferentattitudesamongscientiststowardstheconsequencesofglobalwarming.•Introducetheproblemofglobalwarming.•Giveawarningandraiseaquestionforthereaderstothinkover.I(1)II(2-3)III(4-6)IV(7)Whowrotethearticle?Whatisthenameofthemagazine?Carefulreading:thefirstparagraph:SophieArmstrongEarthCarePartII(Para2-3)1.Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans.2.JaniceFosterbelievesthatshecanmeasurethefutureglobalriseintemperature.3.GreenhouseGasesaretotallybad.FTF1.Greenhouseeffectisanaturalp_______.______amountsofGreenhousegasesintheatmosphere.Buttheproblembeginswhenweaddhugeqofextracarbondioxidetotheatmosphere.Therefore,moreheatenergyistintheatmospherecausingtheglobaltemperatureto_________.FillintheblanksaboutthecausesofGreenhouseeffect.henomenonuantitiesrappedgoupSmallPara4.thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150years1.Whomadeaccuratemeasurementsoftheamountofcarbondioxide?2.Howmuchhasincreased?CharlesKeelingThecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.Para5.Howhighwillthetemperaturego?Theamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degrees.WhatdoDr.JaniceFosterandthescientistGeorgeHambleythinkabouttheconsequencesofglobalwarming?Dotheyagreewithoneanother?Para6Theydon'tagreewitheachother.Dr.JaniceFosterthinksitisserious.GeorgeHambleythinksglobalwarmingwillbemildwithfewbadenvironmentalconsequences.Doesglobalwarmingmatter?PositiveeffectsNegativeeffects1.causethesealeveltorise2.severestorms3.floods4.droughts5.famines6.thespreadofdiseases7.disappearanceofspeciesPositiveeffectsNegativeeffects1.causethesealeveltorise2.severestorms3.floods4.droughts5.famines6.thespreadofdiseases7.disappearanceofspeciesPositiveeffectsNegativeeffects1.makeplantsgrowquicker2.cropswillproducemore3.agreaterrangeofanimals4.makelifebetterDisscussion:Howtoreducegreenhousegases?Haveadisscussionwithyourclassmates.Theearthisbecomingwarmer,doesitmatter?Homework1.Readthetextagain,andtrytoretellit.2.Findoutthedifficultsentencesinthepassage.