Unit 2 Saving the Earth Topic 2 Section C 示范公开课教学课件【九年级英语上册仁爱版】

Unit2SavingtheEarthSectionCTopic2

Alltheseproblemsareveryserious.Warming-upGuess:WhathappenstotheEarth?Pre-readingWhat’sthegreenhouseeffectorglobalwarming?Carbondioxide(二氧化碳)increasesalotandformsa“blanket”tostoptheheatfromthesunfromescapingfromtheearth.Sothetemperatureisrising.Thisiscalled“thegreenhouseeffect”or“globalwarming”.Freetalkozonelayer臭氧层What’sozonelayer?Ozoneisaspecialkindofoxygen.Itcanprotecttheearth.Nowpeopleproducelotsofharmfulchemicalsintotheair.Theycauseabigholeintheozonelayer.Sotheradiationcanpassthroughtheholeandreachtheearthdirectly.Pre-readingduringthisperiod在此期间takeaway拿走e.g.CanItakeawaythisbook?formv.

出现；形成n.种类，形式risev.上升；起床；升起

escapev.渗出；逃跑LanguagepointsPre-readingLookandpredictThemainideaofthepassagemaybe________________________________.theproblemsaboutourenvironmentPre-readingfewertreesfactorypollutiontrafficpollutiontheozonelayermorecarbondioxideListenandmatchWhile-reading_________Allovertheworld,peoplehavecutdownmillionsoftrees.Whenitrainsorwhenthewindblows,theearthistakenaway.Forestshavebecomedeserts,somanykindsofanimalsandplantsaredisappearing.Choosesuitabletitlesforparagraphs2—6CA.TrafficpollutionB.FactorypollutionC.FewertreesD.TheozoneholeE.MorecarbondioxidePara.2While-readingA.TrafficpollutionB.FactorypollutionC.FewertreesD.TheozoneholeE.MorecarbondioxidePara.3While-readingPara.4_________

Inbigcities,carsandbuseshavepollutedtheair.Nowmanypeopleincitieshavehealthproblems.A_________Factorieshavealsopollutedthelandandthewater.Asaresult,manyriversandlakesarenowdead.BA.TrafficpollutionB.FactorypollutionC.FewertreesD.TheozoneholeE.MorecarbondioxidePara.5While-reading_________

Aroundtheearth,there’saspecialkindofoxygencalled“ozone”(O3).Itisimportanttotheearth.Butnowairpollutionisdestroyingitandmakingaverybigholeintheozonelayer.Toomuchharmfulradiationfromthesunpassesthroughtheholeandreachestheearthdirectly.Thisisverydangerousbecausethiskindofradiationcancausecancer.

DA.TrafficpollutionB.FactorypollutionC.FewertreesD.TheozoneholeE.MorecarbondioxidePara.6While-reading_________Carbondioxide(CO2)intheairhasincreasedalot.Itmainlycomesfromburningoil,coalandwood.Thishasformedablanketaroundtheearth.Theheatfromthesuncan’tescapesothetemperatureisrising.Thisiscalled“thegreenhouseeffect”.Itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange.

EReadandcompletethefollowingtask1.Whatdoesourplanetmeanhere?

A.Thesun. B.Mars.

C.Themoon. D.Theearth.2.Inthepassage,blanketrefersto_____.A.carbondioxidearoundtheearthB.theozonelayerinthesky

C.theforestsaroundtheworldD.pollutionallovertheworld3.TheworditinParagraph5refersto_____.

A.CO2B.O3C.O2D.H2OWhile-readingCompletethenotesProblemEffectontheenvironmentfewertreesforestsbecomedeserts,animalsandplantsdisappeartrafficpollutiongreenhouseeffect,levelofoceansrising,climatechange……carsandbusespolluteair,healthproblemspollutelandandwater,riversandlakesdeadharmfulradiationreachestheearth,causecancerfactorypollutionozoneholemoreCO2While-readingCombinethekeypointsinthetabletoformashortpassagePost-readingProblemEffectontheenvironmentfewertreesforestsbecomedeserts,animalsandplantsdisappeartrafficpollutiongreenhouseeffect,levelofoceansrising,climatechangecarsandbusespolluteair,healthproblemspollutelandandwater,riversandlakesdeadharmfulradiationreachestheearth,causecancerfactorypollutionozoneholemoreCO2AppreciateapossibleversionAsweallknow,waterpollutionisbecomingmoreandmoreserious.Somefactoriespourwastewaterintotherivers.Asaresult,itmakesthewaterdirtyandsmellterrible.Mostoffishinthewaterhavediedandwecan’tswiminthewater.Waterisveryimportanttohumanbeings,soweshoulddoourbesttoprotectandsaveit.Luckily,ourgovernmentistakingmeasurestoprotectthewaterfrompollution.Post-readingSummaryProblemEffectontheenvironmentfewertreesforestsbecomedeserts,animalsandplantsdisappeartrafficpollutiongreenhouseeffect,levelofoceansrising,climatechangecarsandbusespolluteair,healthproblemspollutelandandwater,riversandlakesdeadharmfulradiationreachestheearth,c