九年级英语上册 Unit 2 Topic 2 All these problems are very serious Section C课件 （新版）仁爱版.ppt

Unit2SavingtheEarth,Topic2Alltheseproblemsareveryserious.,SectionC,Inourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?,cities,pollute,healthproblems,Inourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?,factories,thelandandtheair,dead,Inourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?,cutdown,millionsof,takeawaytheearth,beedesert,Inourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?,oxygen,aspecialkindofoxygencalled“ozone”(O3),averybigholeintheozonelayer,toomuchharmfulradiationfromthesun,Inourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?,CO2carbondioxideincreasealot,forma“blanket”,theheatfromthesuncantescape,causetheleveloftheseatorisecalled“thegreenhouseeffect”or“globewarming”,Whatotherkindsofenvironmentalproblemscanyouthinkof?Talkaboutthemwithyourclassmates.,fewertrees,factorypollution,trafficpollution,theozonelayer,morecarbondioxide,Canyoumatchthem?,Fewertrees,Factorypollution,Trafficpollution,Theozonelayer,Morecarbondioxide,Alltheseproblemsareveryserious.Whatcanwedotosolvethem?,Canyouchooseasuitabletitleforeachparagraphfromthephrasesbelow?,Theearthis4600millionyearsold.Wehumanshavelivedonearthforonly35000years,butduringthisperiodwehavechangedourplanetalotinmanyways.Somethingswevedoneareverygoodfortheearthwhilesomearebad._Allovertheworld,peoplehavecutdownmillionsoftrees.Whenitrainsorwhenthewindblows,theearthistakenaway.Forestshavebeedeserts,somoreandmoresortsofanimalsandplantsaredisappearing.,FewerTrees,_Inbigcities,carsandbuseshavepollutedtheair.Manypeopleincitiesnowhavehealthproblems.,_Factorieshavealsopollutedthelandandthewater.Asaresult,manyriversandlakesarenowdead._Aroundtheearth,theresaspecialkindofoxygencalled“ozone”(O3).Itisimportanttotheearth.Butnowairpollutionisdestroyingitandthathasmadeaverybigholeintheozonelayer.Toomuchharmfulradiationfromthesunpassesthroughtheholeandreachestheearthdirectly.Thisisverydangerousbecausethiskindofradiationcancausecancer.,TrafficPollution,FactoryPollution,TheOzoneLayer,_Carbondioxide(CO2)intheairhasincreasedalot.Itmainlyesfromburningoil,coalandwood.Thishasformeda“blanket”aroundtheearth.Theheatfromthesuncantescapesothetemperatureisrising.Thisiscalled“thegreenhouseeffect”.Itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange.Alltheseproblemsareveryserious,sowemustdosomethingnow.,MoreCarbonDioxide,Read1aagainandchoosethebestanswers.,1、Whatdoesourplanetmeanhere?A.Thesun.B.Mars.C.Themoon.D.Theearth.,Read1aagainandchoosethebestanswers.,2、WhichisNOTtrue?A.Carscanpollutetheair.B.Factoriescanpollutethewater.C.Thefewertrees,thebetter.D.Notallthethingswehavedonearegoodfortheearth.3、Theworditinthepassagerefersto_.A.CO2B.O3C.O2D.H2O,Read1aagainandchoosethebestanswers.,4、Inthepassage,“blanket”refersto_.A.carbondioxidearoundtheearthB.theozonelayerintheskyC.theforestsaroundtheworldD.pollutionallovertheworld5、Theleveloftheoceansisrisingbecauseof_.A.pollutionB.fewtreesC.thegreenhouseeffectD.changesintheclimate,Read1aagainandchoosethebestanswers.,6、Whatisthebesttitleforthispassage?A.EnvironmentalProblemsB.PollutionontheEarthC.HopefortheFutureD.TheGreenhouseEffect,Ozoneisveryimportanttotheearth.,O3:,Writtenwork,Discussthemeaningsofthefollowingexpressionsandthenwritedownhowtheyaffecttheenvironment.,Aspecialkindofoxygencalled“ozone”,Theozonelayercanpreventthesunsharmfulradiationfromreachingtheearth.Butnowairpollutionisdestroyingtheozonelayer.Thisisverydangerousbecausethiskindofradiationcancausecancer.,CO2:,thegreenhouseeffect:,Moreandmorecarbondioxideformsa“blanket”aroundtheearth.,Writtenwork,Discussthemeaningsofthefollowingexpressionsandthenwritedownhowtheyaffecttheenvironment.,Carbondioxide.Itmainlyesfromburningoil,coalandwood.,Carbondioxidearoundtheearthmakesthetemperaturerise.,Theheatfromthesuncantescapesothetemperatureisrising.Itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange.,GroupworkAreyouagreenperson?Doyouwanttoknowhowmanypeopleareturninggreeninyourclass?Workwithyourpartnersanddesignaquestionnaire(