高中英语Unit 4 Global warming ReadingVIP免费

Unit4GlobalwarmingPartOne:TeachingDesign(第一部分：教学设计)Period1:Asamplelessonplanforreading(THEEARTHISBECOMINGWARMER—BUTDOESITMATTER?)AimsTolookandlistsourcesofenergyToreadaboutglobalwarmingProceduresI.WarmingupWarmingupbydefiningHello,everyone.Todaywearegoingtoreadaboutglobalwarming.Butfirstlet’sthinkaboutwhatmovestheworldaround.Yes,itisenergy.Butwhatisenergy?Renewableenergysourceslikewindpowerdon'temitcarbondioxide.Energyisafundamentalquantitythateveryphysicalsystempossesses;itallowsustopredicthowmuchworkthesystemcouldbemadetodo,orhowmuchheatitcanproduceorabsorb.Inthepast,energywasdiscussedintermsofeasilyobservableeffectsithasonthepropertiesofobjectsorchangesinstateofvarioussystems.Basically,ifsomethingchanges,somesortofenergywasinvolvedinthatchange.WarmingupbyobservingEnergyissoimportant,butwheredoesitcomefrom?Therearedifferentformsofenergy:▲Lightenergy光能▲Heatenergy热能▲Soundenergy声能▲Chemicalenergysource化学能源▲Nuclearenergy核能▲Internalenergy内能用心爱心专心116号编辑▲Kineticenergy动能▲Potentialenergy势能能源类型定义实例一次能源直接来自自然界而未经加工转换的能源化石燃料、太阳能、核能、生物燃料、水能等二次能源由一次能源直接或间接转化而来的能源电能、煤气、汽油、沼气、氢能等可再生能源不随其本身的转化或被人类利用而减少的能源太阳能、生物能、水能、风能、地热能等非再生能源随其本身的转化或被人类利用而减少的能源化石燃料、核燃料等Energyismeasuredinjoules(J).Energycandowork.Whenenergychangesfromoneformtoanother,theamountofenergystaysthesame.Energycannotbemadeordestroyed.Thisfactiscalled“conservationofenergy”.Mattercanbemadeintoenergythroughprocesseslikenuclearfissionandnuclearfusion.II.Pre-reading1.QuestioningandansweringHaveyoueverseenagreenhouse?Whatisit?Whatisitfor?LiHongju,couldyoutelltheclassinEnglishwhatyouknowaboutagreenhouse?Agreenhouseisbuiltofglasstobeusedforgrowingplants.Theairinsidethegreenhouseiswarmbecausetheglassletsinthesunandkeepsitfromrunningaway.Sotheairinsideiswarmandisgoodforgrowingplantsthroughoutthecoldseasons.2.TalkingandsharingNowlookatthewordGREENHOUSEGASES.Whatdoesitmean?Greenhousegases(GHG)aregaseouscomponentsoftheatmospherethatcontributetothegreenhouseeffect.Themajornaturalgreenhousegasesarewatervapor,whichcausesabout36-70%ofthegreenhouseeffectonEarth(notincludingclouds);carbondioxide,whichcausesbetween9-26%;andozone,whichcausesbetween3-7%(notethatitisnotreallypossibletoassertthatsuch-and-suchagascausesacertainpercentageoftheGHE,becausethe用心爱心专心116号编辑influencesofthevariousgasesarenotadditive.Thehigherendsoftherangesquotedareforthegasalone;thelowerend,forthegascountingoverlaps).Naturallyoccuringgreenhousegasesincludewatervapor,carbondioxide,methane,nitrousoxide,andozone.Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyoccurringgases.Verypowerfulgreenhousegasesthatarenotnaturallyoccurringincludehydrofluorocarbons(HFCs),perfluorocarbons(PFCs),andsulfurhexafluoride(SF6),whicharegeneratedinavarietyofindustrialprocesses.Eachgreenhousegasdiffersinitsabilitytoabsorbheatintheatmosphere.HFCsandPFCsarethemostheat-absorbent.III.ReadingReadingaloudtotherecordingNowpleaselistenandreadaloudtotherecordingofthetextTHEEARTHISBECOMINGWARMER—BUTDOESITMATTER?Payattentiontothepronunciationofeachwordandthepauseswithineachsentence.Iwillplaythetapetwiceandyou’llreadaloudtwice,too.世界初级能源消耗能源石油煤可燃气水能核能百分...