湖南省耒阳市冠湘中学九年级英语上册 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 becomedesert inourdailylife weshouldfacemoreenvironmentalproblems canyousaysomethingaboutthem oxygen aspecialkindofoxygencalled ozone o3 averybigholeintheozonelayer toomuchharmfulradiationfromthesun inourdailylife weshouldfacemoreenvironmentalproblems canyousaysomethingaboutthem co2carbondioxideincreasealot forma blanket theheatfromthesuncan tescape causetheleveloftheseatorisecalled thegreenhouseeffect or globewarming whatotherkindsofenvironmentalproblemscanyouthinkof talkaboutthemwithyourclassmates fewertrees factorypollution trafficpollution theozonelayer morecarbondioxide canyoumatchthem fewertrees factorypollution trafficpollution theozonelayer morecarbondioxide alltheseproblemsareveryserious whatcanwedotosolvethem 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 trafficpollution factorypollution theozonelayer carbondioxide co2 intheairhasincreasedalot itmainlycomesfromburningoil coalandwood thishasformeda blanket aroundtheearth theheatfromthesuncan tescapesothetemperatureisrising 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 theozonelayercanpreventthesun sharmfulradiationfromreachingtheearth butnowairpollutionisdestroyingtheozonelayer thisisverydangerousbecausethiskindofradiationcancausecancer co2 thegreenhouseeffect moreandmorecarbondioxideformsa blanket aroundtheearth writtenwork discussthemeaningsofthefollowingexpressionsandthenwritedownhowtheyaffecttheenvironment carbondioxide itmainlycomesfromburningoil coalandwood carbondioxidearoundtheearthmakesthetemperaturerise theheatfromthesuncan tescapesothetemperatureisrising itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange groupworkareyouagreenperson doyouwanttoknowhowmanypeopleareturninggreeninyourclass workwithyourpartnersanddesignaquestionnaire