北师大版高中英语选修八UNIT 22《ENVIRONMENTAL PROTECTION》（THE SECOND PERIOD）教案

安徽省滁州市第二中学 高中 高中语文新课程标准高中物理选修31全套教案高中英语研修观课报告高中物理学习方法和技巧高中数学说课稿范文 英语Unit22EnvironmentalProtectionTheSecondPeriodLesson1GlobalWarming 教案 中职数学基础模块教案 下载北师大版¥1.2次方程的根与系数的关系的教案关于坚持的教案初中数学教案下载电子教案下载 北师大版选修8Teachinggoals教学目标1.TargetLanguage目标语言a.重点词汇和短语consensus,beyond,relevant,refer,bounce,pin,coincidence,condemn,federal,reservation,sacrifice,advocate,recycle,substitute,beyondone’scontrol,takeaction,aheadofb.重点句子Inthelastfewdecades,scientistshavereachedconsensusandreportedthathumanbeingsarecausingchangesintheEarth’sclimate—somethingpreviouslyseenasbeyondourcontrol.2.Abilitygoals能力目标Learnwhatglobalwarmingisandenablestudentstolearnitscausesandconsequences.3.Learningabilitygoals学能目标Byreadinganarticlehelpstudentstolearnhowtheycanhelpsolvetheproblemofglobalwarming.Teachingimportantpoints教学重点Whathumanactivitiesarecausingglobalwarmingandhowwecanhelpsolvetheproblemofglobalwarming.Teachingdifficultpoints教学难点Howwecanhelpsolvetheproblemofglobalwarming.Teachingmethods教学方法Listening,reading,discussing.Teachingaid教具准备Multimediacomputer.Teachingprocedures&ways过程与方式StepILeadinginInthisprocedurestudentswilltalkaboutthecausesandconsequencesofglobalwarming.BeginthelessonbyaskingstudentstodiscussthequestionsinbeforeyoustartT:YesterdaywelearnedfromthepassageinCultureCornerthatgasesfromburningcoalandoilarethemajorcausesofglobalwarming.Didyoumakeyoursurveyonhowstudentscometoschool?S1:Iasked40students.Teninthefortycometoschoolbybus.Twenty-oneridebicycles.Eightofthefortytakeacarandonlyonewalkstoschool....T:Fromthesurveyyoumadewecanseemostofstudentsinourschooltakeagreenwaytoschool.I’mgladwearenothavingsomanycars.Becausegasespumpedintotheatmospherefromcarswillspeedupglobalwarming.Haveyounoticedthatin2006wehadaverywarmwinter?ExpertssayglobalwarminghaschangedtheclimateinChina.Inthisclasswearegoingtolearnmoreaboutglobalwarming.Wewillreadanarticle“Canwetaketheheat?”Beforewestartthetext,pleasediscussthequestioninBeforeyoustart.StepIIBeforeyoustartDiscussthetwoquestionsinBeforeyoustartandworkoutthemeaningsofthegivenwords.T:OK,openyourbooksanddiscussthequestioninBeforeyoustartonPage6.Whichcountriesdoyouthinkcontributemoretoglobalwarming,developedcountriesordevelopingcountries?Ss:Developedcountries.Becausetheyhavemorecarsandfactoriesandgasesfromcarsandfactoriesarethemajorcauseofglobalwarming.T:Goodanswer.PleasescanthetextforthegivenwordsinEx2andtrytoworkouttheirmeaning.Whilestudentsarediscussingthewords,Teachershouldwalkaroundtheclassroomandgivenecessaryhelpwhenneeded.Severalminuteslater,askstudentstopresenttheiranswerseitherinEnglishorChinese.Studentsmayevenbeencouragedtoexplainthemeaningsusingpictures.ShowthesuggestedanswersonthePowerPoint.StepIIIReadtolearnDealwiththereadingpart.ScanningAskstudentstoscanthetextandfindwhatexactlyglobalwarmingis.T:WhatisthetitleofLesson1?Ss:GlobalWarming.T:Doyouknowwhatexactlyglobalwarmingis?Pleasescanthetextandfindtheanswerinthetext.Ss:GlobalwarmingreferstoanaverageincreaseintheEarth’stemperature.T:Quitegood!Thenskimthetextandfindwhathumanactivitiesarecausingglobalwarming.S:Asaresultofincreasedindustry,agriculture,thecuttingdownofforests,theincreaseintransportandtheburningoffuels,nearly6tonesofcarbondioxidegoesintotheatmosphereeveryyearforeveryoneoftheEarth’s6billionpeople.Overthelast100years,theglobalaveragetemperaturehasincreasedby1°F.Ifwecontinuetoproducecarbondioxideandothergasesinsuchquantities,wearecondemninglifeonEarthandshouldexpectsevereconsequences.SkimmingShowthefollowingformonthePowerPointandaskthemtoworkingroupsandcompletetheform.termdefinitioncausesconsequenceshowtosolvetheproblemGlobalwarmingFiveminuteslater,showthesuggestedanswersonthePowerPoint.termdefinitioncausesconsequenceshowtosolvetheproblemGlobalwarmingreferstoanaverageincreaseintheEarth’stemperature.Whengreenhousegasesintheatmosphereincrease,moreheatistrapped.(thegreenhouseeffect)TheEarth’stemperaturerises.Government’sactionandeachpersonshouldplaytheirpart(smallchangesmadebyeveryoneworldwide).AskstudentstoskimthetextandthenfinishEx3onPage7.Studentsmaydiscussthequestionsingroups.T:LookthroughthequestionsinEx3onPage7first.Thenskimthetexttofindtheanswers.Thenchecktheanswerswiththewholeclass.Suggestedanswers:1.GlobalwarmingisanaverageincreaseintheEarth’stemperature.2.Increasedindustry,agriculture,thecuttingdownofforests,theincreaseintransportandtheburningoffuelsarecausingglobalwarming.3.By1°F.4.Yes,theyare.BecausegreenhousegasestrapheatfromthesunintheEarth’satmosphere.Otherwisetheearthwouldbeverycoldandunsuitableforlife.5.Wecantakepublictransport,recycling,usinglow-flowshowerheads,buyingefficientlightbulbstostopglobalwarming.StepIVExplanationDuringthisprocedureteacherwillplaythetapeforstudents.Studentswillunderlinethedifficultsentences.Afterlisteningtothetape,Teacherwillexplainthetextanddealwithlanguageproblems.T:Afterdoingthecomprehensionofthetext,let’sdealwithsomedifficultlanguagefocuses.NowIwillplaythetapeforyou.Pleasemakeamarkwhereyouhavedifficulties.Afterlisteningtothetape,explainthedifficultsentencestostudents.Beforeexplainingthedifficultpoints,studentsareaskedtorefertothenotestothetextonpage114.T:Doyouhaveanydifficultieswiththetext？S1:Couldyoupleaseexplainthesecondparagraphtous?T:Thesecondparagraphtellsustheassociationgreenhousegaseshavewithglobalwarming.The“greenhouseeffect”oftengetsabadrapbecauseofitsassociationwithglobalwarming,butthetruthiswecouldn’tlivewithoutit.Lifeonearthdependsonenergyfromthesun.About30percentofthesunlightthatbeamstowardEarthisdeflectedbytheouteratmosphereandscatteredbackintospace.Therestreachestheplanet’ssurfaceandisreflectedupwardagainasatypeofslow-movingenergycalledinfraredradiation.Asinfraredradiationiscarriedaloftbyaircurrents,itisabsorbedby“greenhousegases”suchaswatervapor,carbondioxide,ozoneandmethane,whichslowsitsescapefromtheatmosphere.Althoughgreenhousegasesmakeuponlyabout1percentoftheEarth’satmosphere,theyregulateourclimatebytrappingheatandholdingitinakindofwarm-airblanketthatsurroundstheplanet.Thisphenomenoniswhatscientistscallthe"greenhouseeffect."Withoutit,scientistsestimatethattheaveragetemperatureonEarthwouldbecolderbyapproximately30degreesCelsius(54degreesFahrenheit),fartoocoldtosustainourcurrentecosystem.WhilethegreenhouseeffectisanessentialenvironmentalprerequisiteforlifeonEarth,therereallycanbetoomuchofagoodthing.Theproblemsbeginwhenhumanactivitiesdistortandacceleratethenaturalprocessbycreatingmoregreenhousegasesintheatmospherethanarenecessarytowarmtheplanettoanidealtemperature.Today,theincreaseintheEarth’stemperatureisincreasingwithunprecedentedspeed.Tounderstandjusthowquicklyglobalwarmingisaccelerating,considerthis:Duringtheentire20thcentury,theaverageglobaltemperatureincreasedbyabout0.6degreesCelsius(slightlymorethan1degreeFahrenheit).Usingcomputerclimatemodels,scientistsestimatethatbytheyear2100theaverageglobaltemperaturewillincreaseby1.4degreesto5.8degreesCelsius(approximately2.5degreesto10.5degreesFahrenheit).Nowpleasereadthefirstsentenceinthesecondparagraph.What’sthefunctionofthat-clause?S1:Itisanattributiveclausemodifying‘anaverageincrease’.T:Good!‘that’refersto‘anaverageincreaseintheEarth’stemperature’.FromthissentencewecanlearnanaverageincreaseintheEarth’stemperaturewillcauseclimatechanges.Inthesecondsentencethereisalsoanattributiveclausecausedby‘which’.Whatdoes‘which’referto?S2:‘Which’referstogreenhousegases.T:Right!GreenhousegasestrapheatfromthesunintheEarth’satmosphere.Withoutgreenhousegases,theearthwouldbeverycoldandimpossibleforlife.Doyouhaveanyotherquestions?S2:No.T:Therearemanyusefulphrasesinthetext.Pleasesumupthephrasesandthenwewillanalyzethetext.StepVPracticeDealwithEx5onpage7.Askstudentstodotheexercisesindividually.Whiledoingtheexercises,remindstudentsthattheyshouldpayattentiontothecorrectformofthegivenwords.Makenecessarychangeswhereneeded.Thenchecktheanswerswiththewholeclass.StepVIAnalyzingthetextHelpstudentsanalyzethestructureofthetext.Askstudentstodiscussingroupsandlatereachgroupwillspeakouttheiropinions.Afterthis,showthesuggestedanswersonthePowerPoint.T:OK.Let’sreadthetextagain.Pleaselookatthestructureofthetext.Youaregiven5minutes.…T:Pleasestophere.I’mgladyouthoughtactivelyandhadaheateddiscussion.Whatisitswritingstyle?Ss:Thistextisanexpositorywriting.T:Whatisthetopicofthetext?Whatisthetextabout?S1:Globalwarming.S2:Thetextintroduceswhatglobalwarmingis.S3:Itscausesandconsequences.S4:Andhowwecanhelpsolvetheproblemofglobalwarming.T:Quitegood.Howmanypartsconsistofthearticle?What’sthemainideaofeachpart?S4:Inmyopinionthearticleismadeupoffourparts.Inthefirstparagraphtheauthorraisesthequestion.Inthesecondparagraphwecanfinditsdefinition.Andthethirdandfourthparagraphstellusitscausesandconsequences.Andthelastparttheauthorgivesussometipsonhowtosolvetheproblem.T:Welldone!Ifstudentshavedifferentopinions,Teachermayhelpthemanalyzethetext.ShowthefollowingonthePowerPoint.Part1(thefirstparagraph)Globalwarmingcouldbeoneofthebiggestenvironmentalproblemsfacingthe21stcentury.Part2(Para.2)Whatglobalwarmingis.Part3(Para.3-4)Itscausesandconsequences.Part4(Para.5)Tipsonhowtosolvetheproblem.T:Afterlearningthetipsonhowtosolvetheproblem,let’sdiscusswhatwewilldoeverydaytohelpreducegreenhousegases.Pleasemakeyourvoiceheardandgetinvolvedinthediscussion.Afterthediscussion,pleasewriteyoursuggestionsonapieceofpaperandputitonyourbulletinboardsothatyoucanshareyourideaswiththewholeclass.StepVIIDiscussionDividethestudentsintodifferentgroupsanddiscussthequestionsofEx4onPage7.Theyaregivenseveralminutestodiscuss.Eachmemberisencouragedtothinkactivelyandparticipateinthediscussion.Makesureallthestudentshavetheirownopinions.Everygroupshouldhavetheirsecretarytowritedownthediscussion.Theneachgroupshouldpinthesuggestionsonthebulletinboardsothateveryonecanreadthemandlearnaboutothers’goodwaytoreducegreenhousegases.T:Pleaseworkingroupsandexpressyourselffreely.Becauseeveryonehashisorherownpracticalway,pleaseshareyourideaswithyourgroupmembers.…T:Beforestartingyourdiscussion,pleasereadthefollowing.ShowthefollowingonthePowerPoint.TheTopFiveGlobalWarmingPolluters!1. TheUnitedStates2. China3. Russia4. Japan5. America’sCarsandLightTrucksChinatoInvest$175BillioninEnvironmentalProtectionOverFiveYearsChinahascreatedan“economicmiracle”overthepasttwodecades,airpollutionischokingitscities,chemicalspillsarefoulingitsriversanddrinkingwatersupplies,soilcontaminationisunderminingitsagriculture,andrawsewageiscausingwidespreaddisease.Thisenvironmentaltollhasledtointernalriots,internationalprotests,andthearrestandtrialofaleadingChineseenvironmentalist.In2006,Chinapledgedtoinvest$175billionby2010tocontrolwaterpollution,improveairquality,increasesolidwastedisposalandreducesoilerosion—investmentsintendedtopayeconomicaswellasenvironmentaldividends.AsampleofEx4onpage7ResponsibleChoicesThechoiceswemakeandtheproductswebuytestourcommitmenttomaintainahealthyplanet.Whenweburnfossilfuelssuchasoil,coal,andnaturalgastorunourcarsandlightourhomes,wepumpcarbondioxide(CO2)intotheair.Thisthickenstheheat-trappingblanketthatsurroundstheplanet,causingglobalwarming.Choosingmoderntechnologycanreduceouruseoffossilfuelsandhelpprotecttheplanet.Thesestepswillhelpcurbglobalwarming,saveyoumoney,andcreateasaferenvironmentforthefuture.DriveSmart!Awell-tunedcarwithproperlyinflatedtiresburnslessgasolinecuttingpollutionandsavingyoumoneyatthepump.Ifyouhavetwocars,drivetheonewithbettergasmileagewheneverpossible.Betteryet,skipthedriveandtakepublictransit,walk,orbicyclewhenyoucan.Replaceincandescentlightbulbswithcompactfluorescentsbulbs.Especiallythoseburnthelongesteachday.Compactfluorescentsproducethesameamountoflightasnormalbulbs,butuseaboutaquarteroftheelectricityandlasttentimesaslong.Eachswitchyoumakehelpscleantheairtoday,curbglobalwarming,andsaveyoumoneyonyourelectricitybill.Becomeasmartwaterconsumer.Protectingforestsisabigstepontheroadtocurbingglobalwarming.Trees"breathein"carbondioxide,butslash-and-burnfarmingpractices,intensivelivestockproduction,andlogginghavedestroyed90percentofthenativeforestsintheUnitedStates.Andyoucantakeactioninyourownbackyard—plantingshadetreesaroundyourhousewillabsorbCO2,andslashyoursummerair-conditioningbills.Reduce!Reuse!Recycle!Producingnewpaper,glass,andmetalproductsfromrecycledmaterialssaves70to90percentoftheenergyandpollution,includingCO2thatwouldresultiftheproductcamefromvirginmaterials.Recyclingastackofnewspapersonly4feethighwillsaveagood-sizedtree.Please...buyrecycledproducts!Mountalocalcampaignagainstglobalwarming.Educateyourcommunityabouthowitcancutglobalwarmingpollution.Supportmeasuresatthenational,state,andlocallevelthat: Makeautomobilesgofurtheronagallonofgas; Acceleratetheuseofclean,renewableenergysources,suchassolarandwind; Increaseenergyefficiencyandconservation; Preserveforestsaroundtheworld.StepVIIIHomeworkPickoutthereportingverbsinthetext.