北師大版Unit22.Lesson1Global-Warming閱讀課件說課材料

Lesson1GlobalWarming第一頁，共27頁。Environmentalproblems?airpollutionglobalwarmingendangeredanimalswaterpollutionsoilpollutionsandstormforestation

noisepollutiondesertificationwarm-up第二頁，共27頁。/b/108435/3369510.htmlQuestion:Whatdoyouknowaboutglobalwarming?Brainstorming第三頁，共27頁。RaisingtheEarth’stemperaturewillcausesubstantialmeltingofthepolaricecapswhichwillthenleadtoariseinthesealevel

andsubsequentfloodingoflow-lyingareas.第四頁，共27頁。Globalwarmingwillalsochangecountries’climatesandcausehugefoodandwatershortages.第五頁，共27頁。Mostenvironmentalistsagreethatglobalwarmingisanunnaturalphenomenoncausedbytheemissionsfromburningcarbonfuelssuchascoal,oilandpetrol;theycallthisthe“greenhouseeffect”.第六頁，共27頁。Therehavebeenseveralsummitsofgovernmentstodiscussthisproblembutmanycountriesdon’twanttomakechangestotheirfactoriesandindustrialworksasthiswouldcostthemmoney.第七頁，共27頁。Whichcountriesdoyouthinkcontributemoretoglobalwarming?a)developedcountriesb)developingcountriesDevelopedcountries–moreindustryandtechnology.第八頁，共27頁。PartIIPre-readingCanwetaketheheat?第九頁，共27頁。Guessing:

Basedonthetitleandthefollowingpictures,canyouguesswhat’sthemeaningoftheword“take”?

Pre-reading第十頁，共27頁。Question:Whatisglobalwarming?GlobalwarmingmeansanaverageincreaseintheEarth’stemperaturewhichleadstoclimatechange.While-reading:Skimming第十一頁，共27頁。Readthetextandfindmainideaofeachparagraph.A.Drawreaders’attentiontothetopicbyaskingquestions.B.Whatshouldhumanbeingsdo.C.Whatisglobalwarming.D.Consequencesofglobalwarming.E.WhatcauseglobalwarmingPara1.Para2.Para3.Para4.Para5.While-reading:Skimming第十二頁，共27頁。consensus,bounce,agriculture,coincidence,condemn,reservation,sacrifice,advocateScanthetextbelowforthesewordsandworkouttheirmeanings.Scanning:第十三頁，共27頁。Scanthetextbelowforthesewordsandworkouttheirmeanings.consensusbounceagriculturecoincidencearemarkableconcurrenceofeventsbychancemovequicklyup,back,orawayfromasurfaceafterhittingageneralagreementthescienceorpracticeoffarming第十四頁，共27頁。condemnreservationsacrificeadvocatetheactionofreservingsomethingtorecommendorsupportpubliclytogiveup(somethingimportantorvalued)becauseofotherconsiderationssentencetoaparticularpunishment,especiallydeath第十五頁，共27頁。1.Whathumanactivitiesarecausingglobalwarming?2.Byhowmuchhastheglobalaveragetemperatureincreasedinthelast100years?3.AregreenhousegasesnecessaryforlifeonEarth?4.Howcanwehelpsolvetheproblemofglobalwarming?Readthetextandanswerthequestions.第十六頁，共27頁。1)Whathumanactivitiesarecausingglobalwarming?Industry,agriculture,thecuttingdownofforests,theincreaseintransportandtheburningoffuelsarecausingglobalwarming.2)Byhowmuchhastheglobalaveragetemperatureincreasedinthelast10years?By1°F(onedegreeFahrenheit).第十七頁，共27頁。3)AregreenhousegasesnecessaryforlifeonEarth?Yes,theyare,becausetheytrapheatfromthesunintheEarth’satmosphere.OtherwisetheEarthwouldbecoldandunsuitableforlife.4)Howcanwehelpsolvetheproblemofglobalwarming?Wecanmakesmallchangesliketakingpublictransport,recycling,usinglow-flowshowerheads,andbuyingenergy-efficientlightbulbstohelpstopglobalwarming.第十八頁，共27頁。Postreading:GroupworkVoiceyouropinions:Whatwillyoudoeverydaytohelpreducegreenhousegases?第十九頁，共27頁。takepublictransportlikebuses，trainsandsubwaysExamples

第二十頁，共27頁。Therecyclingsymbol

buytherecycledproducts第二十一頁，共27頁。uselow-flowshowerheadsbuyenergy-efficientlightbulbs第二十二頁，共27頁。Postreading:GroupworkVoiceyouropinions:Whatwillyoudoeverydaytohelpreducegreenhousegases?第二十三頁，共27頁。Post-reading:vocabularyUsetheexpressionsintheboxinthecorrectformtocompletethesentences.1Waterwas

thefishpondfromtheriver.2Weallneedto

tofinishintime!pumpedintospeedupbeyondourcontrol,pumpinto,asaresultof,inlargequantities,referto,speedup第二十四頁，共27頁。3.Thereisnothingmorewecando.thesituationisnow

.4.

theaccident,sheisnowafraidofwater.5.Thescientist

globalwarmingatleastthreetimesinhisspeech.6.Thefactorywasproducinggreenhousegases_________________.beyondourcontrolAsaresultofreferredto