选修六UnitGlobalwarmingPeriod.doc

Period 5Reading and Writing教学内容分析Theteachingmaterialsofthisperiodcontainthreeparts.ThefirstpartisthereadingpassageonPage30withthetitleof“WhatCanWeDoAboutGlobalWarming？”Itconsistsoftwoletters：arequestfromastudentforhelponaschoolprojectandthereply.Thelettersbringstudentsattentiontoacommonlyheldbeliefthatindividualsarepowerlesstodoanythingaboutenvironmentalproblemsandthatitisgovernmentsthatareinapositiontoactandhavetheresponsibilitytoact.EarthCareslettersuggestswaystosaveenergyandthereforedecreasetheamountofcarbondioxidethatispouredintotheatmosphere.ThesecondpartisExercise2onPage31，whichasksthestudentstomakeaposterfortheirschoolthattellsstudentsvariouswaystheycanreducetheamountofcarbondioxideintheair.Thethirdpartisawritingtaskdesignedbytheteacher，whichasksstudentstowriteashortpassageaboutglobalwarming.Bypracticingwritingthepassage，studentscanstrengthentheirknowledgeaboutglobalwarminganddeveloptheirsenseofenvironmentalprotection.三维目标设计Knowledgeandskills1Toenablethestudentstoknowhowtopreventglobalwarming.2Togetthestudentstolearnthefollowingusefulnewwordsandexpressions：onbehalfof，advocate，commitment，putupwith，pollution，electrical，solongas，casual，andsoon，motor，cans，circumstances，microwave，refresh，educator，contribution.3Tohelpthestudentslearnhowtowriteaposter.4Tofosterthestudentsabilityinskimmingandlookingupinformationinreferencebooksandimprovethestudentsreadingability.ProcessandmethodsReadingforspecificinformation，summarizing，discussingandpracticing.Emotion，attitudeandvalue1Todevelopstudentssenseofenvironmentalprotection.2Todevelopthestudentssenseofcooperationwithotherstosolveproblems.教学重、难点1Theunderstandingofthereadingpassage.2Thefollowingkeyphrases：makeadifference，putupwith，solongas3Thefollowingkeysentences：(1)Together，individualscanmakeadifference.(2)ItisOKtoleaveanelectricalapplianceonsolongasyouareusingit.(3)Getyourparentstobuythingsthatareeconomicalwithenergy.(4)Rememberyourcontributioncounts!4Teachingthestudentshowtowriteaposter.Step1RevisionCheckthehomeworkofthelastperiod.Step2LeadinShowthestudentsthefollowingpicturesontheslideandaskstudentsthefollowingquestions：1Haveyoueverseenthefilm2012?2Whatkindofdisastershaveyouseeninthefilm?3Whathaveyoulearntfromthefilm?Andthenaskthem：Whatcausestheglobalwarming？Leadthemtotellthecause：gasemission.Atthesametimeshowthefollowingpictures：Aftertalkingaboutthecausesofgasemission，askstudentsthequestion“Whatistheeffectofglobalwarming？”Helpthemanswer：naturaldisasters(flood，drought，hurricane，tsunamiandtornado)，spreadofdiseases，sealevelrising，decreaseofspeciesandsoon.Atlast，askthequestion：“Whatcanwedoaboutglobalwarming？”Andthenleadinthereadingtext.Step3Skimming1Skimthefirstletter，andanswerthequestionsbelow：(1)Whoisthewriter?(2)Whatarethetwoconcernsoftheletter?Suggestedanswers：(1)AstudentnamedOuyangGuang.(2)Hisopinionthat，asanindividual，hecanhavenoeffectonenvironmentalproblems.Gettingsomesuggestionsforwhathecandoaboutglobalwarming.2Readthesecondemail，andanswerthefollowingquestion：DoesEarthCareagreewithOuyangGuangsopinionthatindividualscanhavenoeffect?Suggestedanswer：No，EarthCaredoesnotagree.Step4ScanninganddiscussionAskstudentstoscanthelettersandlistEarthCaressuggestionsinthechartonP30，anddiscusswhethertheycancarryouteachsuggestion.Givereasonsfortheiranswers.Andthenaskoneortwogroupstomakeanoralreport.EarthCaressuggestionCanyoucarryitout？ReasonsIfyouarenotusingelectricalappliances，turnthemoff.Yes.Saveenergy.Ifyourecold，putonmoreclothesinsteadofturninguptheheat.Yes.Saveenergy.Motorvehiclesusealotofenergy，sowalkorrideabikeifyoucan.Yes.Saveenergy.Recyclecans，bottles，plasticsandnewspapersandbuythingsmadefromrecycledmaterials.Yes.Saveenergy.Getyourparentsorfriendstobuyproductsthataremadetosaveenergy.Yes.Saveenergy.Plantmoretrees.Yes.Plantsabsorbcarbondioxidefromtheair.Talkwithyourfamilyandfriendsaboutglobalwarmingandtellthemwhatyouvelearned.Yes.Together，individualscanmakeadifference.Step5LanguagestudyShowthestudentsthefollowinglanguagepointsinthepassageinaslideshow.1makeadifference(P30)【原句再现】Together，individualscanmakeadifference.众人拾柴火焰高。【观察探究】(1)ThefactthatIcannoworganizemyowntimemakesabigdifference.现在我能自己安排时间了，这对我有很大的作用。(2)Itmakesnodifferencetomewhatyousay.Imnotgoing.无论你怎么说对我都没有影响，反正我不去。(3)Itwontmakemuchdifferencewhetheryougotodayortomorrow.你今天去也好，明天去也好，关系不大。(4)Shemakesnodifferencebetweenhertwosons.她对两个儿子一视同仁。 【归纳总结】makeadifference(tosb./sth.)意为“对某人/某物起作用、有影响”，difference前面可以加不同的修饰词，如no/some/little/much等。makeadifferencebetween.表示“区别对待”。【即景活用】WhenshallIgothere?It_whetheryougotodayortomorrow.AmadenodifferenceBmadenosenseCmakesnodifference DmakesnosenseSuggestedanswers：C2putupwith(P30)【原句再现】Wedonothavetoputupwithpollution.我们不必忍受污染。【观察探究】(1)IputupwithhersolongasIcould.我尽可能地容忍她。(2)Thatlady，asahousewife，hasalottoputupwith.作为一名家庭主妇，那位妇女必须要忍受许多事情。【归纳总结】putupwith.“容忍，忍受”， 宾语可以是人或者事物。【知识拓展】(1)bear和stand在疑问句和否定句中和can，beableto连用，也表示“忍受”，其宾语多为事物。(2)livewithsth.忍受某事；livewithsb.和某人一起生活。【即景活用】Hebehavedbadlytowardshiswife.Asaresultshecouldnt_himandlefthim.Acomeupwith BcatchupwithCputupwith DliveupSuggestedanswer：C3.solongas(P30)【原句再现】ItisOKtoleaveanelectricalapplianceonsolongasyouareusingitifnot，turnitoff!只要你在使用，让家用电器开着无所谓如果不用，就请关闭！【观察探究】(1)Youcanborrowmybikesolongasyouremembertoreturnitassoonaspossible.只要你记着尽早归还就可以借用我的自行车。(2)Wecansurelyovercomethedifficultiessolongaswearecloselyunited.只要我们紧密地团结在一起，我们就一定能够克服这些困难。【归纳总结】solongas起连词作用，引导条件状语从句，可以与aslongas互换，意思是“只要”，前者语气较强，后者主要用于口语中。【知识拓展】条件状语从句的引导词还可以是if，unless，onconditionthat，suppose，supposing，provided(that)等。【即景活用】_Iamconcerned，weshouldbebraveandwewillreachthetopofthehillatlast_wetryourbesttoclimbthehill.ASolongas；aslongasBAsfaras；asfarasCAsfaras；solongasDOnconditionthat；assoonasSuggestedanswer：CStep6Writing1Askthestudentstomakeaposterfortheirschoolthattellsstudentsvariouswaystheycanreducetheamountofcarbondioxideintheair.Tellstudentstoillustratetheirposterandgiveitaheadingthatwillbeeyecatchingandwillmakeotherswanttoreadit.Suggestedanswer：2Askstudentstochooseatopicfromthelistthattheyfeelstronglyabout.Makenotesonthetopicusingheadingssimilartothetableinthereadingtask.Usethepassageasamodel.Writingtips：Step1：Writeoutthethesisstatement(pointofview)Step2：Writeoutthetopicsentenceofthefirstbodyparagraph.Step3：Givethesupportingpointsanddetailsaboutthefirstsubtopic.Step4：Writeoutthetopicsentenceofthesecondbodyparagraph.Step5：Givethesupportingpointsanddetailsaboutthesecondsubtopic(morebodyparagraphs)Asampleversion：TheEnvironmentalEffectsofFossilFuelsThereisnodoubtthatfossilfuelsbringalotofgoodtous.Butdoyouknowthatmanyoftheenvironmentalproblemsourcountryfacestodayresultfromourfossilfueldependence?Theenvironmentfacesairpollution，globalwarming，acidrain，andseveralotherveryseriousproblemsbecauseofouruseoffossilfuels.Overthelast150years，burningoffossilfuelshasresultedinmorethan25percentincreaseincarbondioxideinouratmosphere.Carbondioxideisoneofthemainfactorsinglobalwarmingwhichisnegativelyaffectingeveryone.Fossilfuelsalsoaffectwaterpollution，landpollution，andthermalpollution(heatpollution)Coalminingisoneofthecausesofpollutionintheenvironment.Aftertheminingiscompleted，thelandwillremainbarren.Materialsotherthancoalarealsobroughttothesurfaceinthecoalminingprocessandtheseareleftassolidwastes.Theproduction，transportation，anduseoffossilfuelsaretoblamefortheeffectsofpollutionontheenvironment.Thenwhatshouldwedo？Weshouldsparenoefforttoimproveourenvironment.Pleasesaveenergyandusefewerfossilfuelsinourdailylives.Step7Homework1Masterthelanguagepointsinthetext.2Finishthewritingtask.Step8Reflectionafterteaching_GlobalWarmingSolutionsWhatCanWeDo?Theevidencethathumansarecausingglobalwarmingisstrong，butthequestionofwhattodoaboutitremainscontroversial.Economics，sociology，andpoliticsareallimportantfactorsinplanningforthefuture.Evenifwestoppedemittinggreenhousegases(GHGs)today，theEarthwouldstillwarmbyanotherdegreeFahrenheitorso.Butwhatwedofromtodayforwardmakesabigdifference.Dependingonourchoices，scientistspredictthattheEarthcouldeventuallywarmbyaslittleas2.5degreesorasmuchas10degreesFahrenheit.AcommonlycitedgoalistostabilizeGHGconcentrationsaround450550partspermillion(ppm)，orabouttwicepreindustriallevels.Thisisthepointatwhichmanybelievethemostdamagingimpactsofclimatechangecanbeavoided.Currentconcentrationsareabout380ppm，whichmeansthereisntmuchtimetolose.AccordingtotheIPCC，wedhavetoreduceGHGemissionsby50%to80%ofwhattheyreontracktobeinthenextcenturytoreachthislevel.Isthispossible?Manypeopleandgovernmentsarealreadyworkinghardtocutgreenhousegases，andeveryonecanhelp.ResearchersStephenPacalaandRobertSocolowatPrincetonUniversityhavesuggestedoneapproachthattheycall“stabilization wedges”ThismeansreducingGHGemissionsfromavarietyofsourceswithtechnologiesavailableinthenextfewdecades，ratherthanrelyingonanenormouschangeinasinglearea.Theysuggest7wedgesthatcouldeachreduceemissio