九年级上Unit2Topic3SectionCppt课件

Unit2Topic3Whatkindsofthingscanwedotoprotecttheenvironment?,SectionC,-ByDavid,1,1._itsraininghard,hekeepsonworkingoutside.2.Kangkangcanplaythevoilin,_Icant.3.Mr.Linisverykind_heisveryhumorous,too.4.Thesuitfitsmewell_Icantaffordit.,Though,while,and,but,Fillintheblanksusingbut,and,thoughandwhile.,Revision:,2,Whatnewwayshavebeeninventedtoproducepower?,Askandanswer:,electricvehicle,biogastechnology,3,Whatnewwayshavebeeninventedtoproducepower?,Askandanswer:,maglevtrain,waterbattery,4,Lookupthesewordsinadictionary.,power,acidrain,nuclear,renewable,electric,efficient,电力；动力；力,酸雨,原子核的，原子能的；核动力的,可更新的,电动的，用电的,效率高的；有能力的,5,Windisusedforproducingelectricityinmanyplaces.,Lookatthefollowingpicturesandguessthemeaningoftheunderlinedword.,Guessinggame,6,Moreandmorepeopleareinterestedinelectriccars.,Guessinggame,7,ThemaglevtraininShanghaiusesmagnets.Themagnetspushthetrainforward.,Guessinggame,8,peopleproducepowerfromcoal,butitisverydirtyandcausesacidrain.,Guessinggame,9,Nuclearpoweriscleanbutitisverydangerous.,Guessinggame,10,Readandunderstand,1a,Choosetherightpictureforeachparagraph.,11,Inmanycountries,peopleproducepowerfromcoal,butitisverydirtyandcausesacidrain.Somecountriesusenuclearenergytoproducepower.However,nuclearpowercanbeverydangerous.Tosolvetheenergyproblem,peopleallovertheworldarelookingallthetimefornewwaystoproducepower.,12,c,_Chinaisoneofthefirstcountriesintheworldtousebiogastechnology.Farmersrecyclestraw,grassandanimalwastetomakebiogas.Thisrenewableenergyisusedinpeopleseverydaylife.,Choosetherightpictureforeachparagraph.,13,_Electricvehiclesweredevelopedinthe1990s.Nowthereareelectricvehiclesinmanycountries.Theyareveryefficientandcostverylittletorun.Althoughelectricvehiclesproducenopollution,therewillbeanincreaseinelectricityneedsiftheyarewidelyused.,a,14,_InChina,thebest-knownmaglevtrainistheGerman-builtoneinShanghai.Ittakespeople30kmtotheairportinjust7minutesandreachesatopspeedof431kmperhour.Itisquietandquick.Thereisnowheelnoise,becausetherearenowheels.Maglevtrainsareveryenergyefficientanddonotpollutetheair.However,maglevguidepathsaremuchmoreexpensivethantraditionalstreetrailways.,b,15,1.Whyisntcoalagoodmaterial?2.Whatisthedisadvantageofusingnuclearpower?3.Whatdoyouthinkofelectriccars?4.Whatdoyouthinkofthemaglevtrain?,Becauseitisverydirtyandcausesacidrain.,Becauseitcanbeverydangerous.,Itisquietandquick.,Theyareveryefficientandcostverylittletorun.,Askandanswer:,Answerthefollowingquestionsaccordingto1a.,16,Read1aagainandfilloutthefollowingtable.,renewable,efficient,cheap,nopollution,quiet,quick,energyefficient,nopollution,Itwillcauseanincreaseinelectricityneeds.,muchmoreexpensivethantraditionaltrains.,Workalone:,1b,17,powerstations,18,themovementofwater,19,thewindpower,20,solarenergy,21,a.Therearemorethan3000powerstationsintheworldthatproduceelectricitybyburninggarbagetoheatwater.b.Peopleusethemovementofwatertoproduceelectricity.c.Windisusedforproducingelectricityinmanyplaces.d.Peopleproduceelectricityfromthesun.,(b),(c),(d),Workalone,(a),2a,22,Whathabitsaregoodfortheenvironment?Listasmanyasyoucan.Themoreyoulist,thegreeneryouare.,GoodHabits,1.Turnoffthelightswhenyouleavearoom.,2.Walkorrideabikeinsteadoftakingabusorataxi.,3.Takeaclothbagwhenyougoshopping.,4.