Lesson1GlobalWarming (2).ppt

北师大高二 Unit22 Unit22EnvironmentalProtection Lesson1GlobalWarming Whatisglobalwarming Lead in Whatwillhappenwithglobalwarming WillglobalwarmingaffectthelifeofNorthPolarBear Whatwillhappentopenguinsbecauseofglobalwarming Whatarethecausesofglobalwarming traffic Factory TheGreenhouseEffect Withoutthegreenhouseheating theEarth saveragetemperaturewouldbeonlyabout 73 C 100 F eventheoceanswouldbefrozenundersuchconditions justliketheMoonandtheMars Mars Moon Whichcountriesdoyouthinkcontributemoretoglobalwarming a developedcountriesb developingcountries Developedcountries moreindustryandtechnology Afterwelearnthislesson wecangetalltheanswerstothequetions Let sgo Para1Para2Para3Para4Para5 WhatcanwedotoreduceglobalwarmingWhatglobalwarmingisandhowitworksReasonsanditseffectsDrawreaders attentiontothetopicbyaskingquestions introducingtheconsequenceofglobalwarming Listentothetapeofthetextandmatchtheheadswiththeparagraphs 1 Whatisglobalwarming GlobalwarmingisanaverageincreaseintheEarth stemperaturethatleadstoclilmatechange 2 Whathumanactivitiesarecausingglobalwarming Industry agriculture thecuttingdownofforests theincreaseintransportandtheburningoffuelsarecausingglobalwarming Readthetextandanswerthequestions 3 Byhowmuchhastheglobalaveragetemperatureincreasedinthelast100years By1 F OnedegreeFahrenheit 4 AregreenhousegasesnecessaryforlifeonEarth Yes theyare BecausetheytrapheatfromthesunintheEarth satmosphere OtherwisetheEarthwouldbecoldandunsuitableforlife 5 Howcanwehelpsolvetheproblemofglobalwarming Wecanmakesmallchangesliketakingpublictransport recycling usinglow flowshowerheads andbuyingenergy efficientlightbulbstohelpstopglobalwarming Fillintheblanksaboutthetext GlobalwarmingmeansanaverageincreaseintheEarth stemperaturewhichcausesclimatechangeinturn Scientiststhinkitis thatcauseglobalwarming especiallygasesfrom andvehicleswhichspeedupglobalwarming factories humanbeings Theyalsothinkglobalwarmingisoneofthebiggestenvironmentalproblemsinthe21stcentury TheEarth stemperatureiscontrolledby likecarbondioxidewhich heatfromthesunintheEarth satmosphere Manyexpertsbelieveglobalwarmingismainlycaused greenhouse gases trap byhuman Overthelast100years theglobalaveragetemperaturehasincreased andifhumanbeingscontinuetopump gasesintotheEarth satmosphere theglobalwarmingwillcausedramaticclimatechangeslikemorefrequentfloods anddroughts by1 F greenhouse heatwaves activities Therearesomeseriousdiseases Sealevelwillbe floatingcoastalarea negativelyaffecting andforestry Sogovernmentsallovertheworldshouldreducethe ofgreenhousegases Weindividualsshouldpay towhatwearedoing even raised fishing release attention smallchangeslike publictransport usinglow flow buyingenergy efficient usingrecycledpaperor lightscanhave onthefutureoftheEarth taking recycling showerheads lightbulbs switchingoff greateffect Whatwillyoudoeverydaytohelpreducegreenhousegases Post reading GroupWork Takingpublictransportlikebusescanreducegreenhousegasemissions AndTakingtraincanalsohelpareductionofgreenhousegas Therecyclingsymbol Buytherecycledproducts Recycledproducts Recyclingthebottles Yourglassbottlescouldberecycledintohouseinsulation plasticbottlescouldbemadeintoacozyfleecejacket Paperrecycling Yourpapercouldbecomepartofaroadorrace track usinglow flowshowerheads buyingenergy efficientlightbulbs replace with Ridebicycles Say No toplasticbags Planttrees 1 Inthelastfewdecades scientistshavereachedconsensusandreportedthathumanbeingsarecausingchangesintheEarth sclimate somethingpreviouslyseenasbeyondourcontrol Languagepoints 分析 本句是一个主从复合句 reached和reported是并列谓语动词 reported后接一个that引导的宾语从句 其中something作 的同位语 previouslyseenasbeyondourcontrol为过去分词短语作something的定语 beyondone scontrol意为 超出 的控制 不受 的控制 changesintheEarth sclimate 句意 最近几十年 科学家们一致认为 人类正在引起地球的气候变化 而这在以前看来是我们不能控制的 仿写 Duetocircumstances theperformancehadtobecancelled 因为我们无法控制事态 演出不得不被取消 beyond ourcontrol 2 Theyclaimthatinthelast50years gasespumpedintotheEarth satmospherebythefactoriesandvehicleshavebeenspeedinguptheprocessofglobalwarmingandaffectingourclimate 分析 本句是一个主从复合句 that从句作claim的宾语 在该从句中 主语为gases speedingup和affecting作并列谓语动词 affecting前省略了havebeen pumpedinto vehicles是过去分词短语作定语 修饰 相当于定语从句that whicharepumpedinto vehicles gases 句意 他们声称 在过去的五十年间 工厂和汽车排放入大气层中的气体加速了全球变暖的进程 影响了我们的气候 3 GlobalwarmingreferstoanaverageincreaseintheEarth stemperaturethat inturn leadstoclimatechange 全球变暖指的是地球温度平均增长 继而导致气候变化 referto 提到 谈到 e g Don tworry Idon tthinkthemanagerreferredtoyou 别担心 我想经理说的不是你 Promisemenottorefertothematteragain 答应我不再提此事了 leadto意为 通向 引起 导致 to为介词 后接名词或动词 ing形式 e g Wecouldn tfindtheroadsleadingto thatledtothevalleys 我们找不到通往山谷的路 Thediscoveryofnewevidenceledto thethiefhavingcaughtB catchthethiefC thethiefbeingcaughtD thethieftobecaught Eatingtoomuchsugarcanleadtohealthproblems 食用过多的糖会引起健康问题 考考你 点拨 选C leadto后接名词或动词 ing形式 故排除B D 根据语境可知小偷应该被抓住 故用被动语态 排除A 4 ScientistsfoundthatthetemperatureoftheEarthiscontrolledbygreenhousegasessuchascarbondioxidewhichtrapheatfromthesunintheEarth satmosphere 分析 本句是一个主从复合句 that引导的宾语从句指的是客观事实 所以用了一般现在时 which引导定语从句 修饰 suchas在此相当于介词like 意为 像 那样 诸如 之类 句意 科学家们发现地球的气温受温室气体如二氧化碳的控制 这些气体能将来自太阳的热量圈在地球的大气层里 greenhousegases 仿写 牛顿发现所有的物质都相互吸引 Newtonfoundthatallmasses eachother attract Usetheexpressionsbelowinthecorrectformtocompletethesentences Exercises beyondourcontrol pumpinto asaresultof inhugequantities referto speedup 1 Waterwas thefishpondfromtheriver 2 Weallneedto tofinishintime 3 Thereisnothingmorewecando Thesituationisnow pumpedinto