Unit2SavingtheEarthTopic2Alltheseproblemsareveryserious.SectionCSectionCInourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?airpollutionInourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?cutdown,millionsof,takeawaytheearth,becomedesertInourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?oxygenaspecialkindofoxygencalled“ozone”(O3)averybigholeintheozonelayer,toomuchharmfulradiationfromthesun臭氧层视频Inourdailylife,weshouldfacemoreenvironmentalproblems.Canyousaysomethingaboutthem?CO2carbondioxideincreasealot,forma“blanket”,theheatfromthesuncan’tescapecausetheleveloftheseatorisecalled“thegreenhouseeffect”or“globewarming”温室效应：视频1,视频2fewertreesfactorypollutiontrafficpollutiontheozonelayermorecarbondioxideCanyoumatchthem?FewertreesFactorypollutionTrafficpollutionTheozonelayerMorecarbondioxideAlltheseproblemsareveryserious.Whatcanwedotosolvethem?Readandunderstand（影片）Canyouchooseasuitabletitleforeachparagraphfromthephrasesbelow?Theearthis4600millionyearsold.Wehumanshavelivedonearthforonly35000years,butduringthisperiodwehavechangedourplanetalotinmanyways.Somethingswe’vedoneareverygoodfortheearthwhilesomearebad._________Allovertheworld,peoplehavecutdownmillionsoftrees.Whenitrainsorwhenthewindblows,theearthistakenaway.Forestshavebecomedeserts,somoreandmoresortsofanimalsandplantsaredisappearing.FewerTrees____________Inbigcities,carsandbuseshavepollutedtheair.Manypeopleincitiesnowhavehealthproblems._____________Factorieshavealsopollutedthelandandthewater.Asaresult,manyriversandlakesarenowdead._____________Aroundtheearth,there’saspecialkindofoxygencalled“ozone”(O3).Itisimportanttotheearth.Butnowairpollutionisdestroyingitandthathasmadeaverybigholeintheozonelayer.Toomuchharmfulradiationfromthesunpassesthroughtheholeandreachestheearthdirectly.Thisisverydangerousbecausethiskindofradiationcancausecancer.TrafficPollutionFactoryPollutionTheOzoneLayer________________Carbondioxide(CO2)intheairhasincreasedalot.Itmainlycomesfromburningoil,coalandwood.Thishasformeda“blanket”aroundtheearth.Theheatfromthesuncan’tescapesothetemperatureisrising.Thisiscalled“thegreenhouseeffect”.Itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange.Alltheseproblemsareveryserious,sowemustdosomethingnow.MoreCarbonDioxideRead1aagainandchoosethebestanswers.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.H2ORead1aagainandchoosethebestanswers.4、Inthepassage,“blanket”refersto____.A.carbondioxidearoundtheearthB.theozonelayerintheskyC.theforestsaroundtheworldD.pollutionallovertheworld5、Theleveloftheoceansisrisingbecauseof____.A.pollutionB.fewtreesC.thegreenhouseeffectD.changesintheclimateRead1aagainandchoosethebestanswers.6、Whatisthebesttitleforthispassage?A.EnvironmentalProblemsB.PollutionontheEarthC.HopefortheFutureD.TheGreenhouseEffectGroupworkAreyouagreenperson?Doyouwanttoknowhowmanypeopleareturninggreeninyourclass?Workwithyourpartnersanddesignaquestionnaire(问卷调查)likethis.Howmanykindsofpollutiondoyouknow?…UsefulexpressionsUsefulexpressions…peoplehavecutdownmillionsoftrees.…theearthistakenaway.Theheatfromthesuncan’tescapesothetemperatureisrising.Itcausestheleveloftheoceanstorise…Bye-bye!Bye-bye!
