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1、Unit2SavingtheEarthTopic2Alltheseproblemsareveryserious.SectionBTeachingaimsanddemands1.Learnsomenewwordsandphrases:sand,cutdown,changeinto,prevent,law,prevent…from,humanbeing,although,turnoff2.Learnsomeusefulsentences:(1)Icouldn’tseeanything,andmyface
2、hurtwhileIwaswalkingdownthestreetjustnow.(2)Passlawsagainstwaterpollution.(3)Remembertoturnthetapoffwhenyouleave.3.Continuetolearntheindefinitepronounandadverb.4.Learntotalkaboutpollutionanditsharm.Newwordssandn.沙，沙子△sandstormn.沙尘暴cutdown砍倒changeinto转换
3、成，把……变成desertn.沙漠v.舍弃，遗弃preventv.法律，法令；定律preventfrom关掉（水、电、煤气等的）龙头humanbeing人althoughconj.虽然，尽管lawn.法律，法令；定律turnoff关掉（水、电、电视、收音机等）tapn.（自来水、煤气等的）龙头1aListen,readandsaysandstorm(Kangkang,MariaandJanearetalkinginaroom.Thewindoutsideisblowingstrongly.)Kang
4、kang:Whatbadweather!Thewindisblowingstronglywithlotsofsand.Icouldn’tseeanything,andmyfacehurtwhileIwaswalkingdownthestreetjustnow.Maria:I'msorrytohearthat.Butwhatcausesthesesandstorms?Jane:Peoplehavecutdowntoomanytrees.Asaresult,alotofrichlandhaschange
5、dintodesert.【点击播放】Maria:That’sbad,buthowcanthataffecttheweather?Jane:Treescanstopthewindfromblowingtheearthaway.Kangkang:Andalotofwatercanbesavedbyforests.Jane:Theycanalsopreventthewaterfromwashingtheearthaway.Kangkang:Cuttingdowntreesisharmfultohumanb
6、eings,animalsandplants.Althoughwehavebuilt“theGreatGreenWall”,westillneedtoworkhardtoprotecttheenvironment.1bWorkaloneRead1aagain.Answerthequestions.Thenmakenotesaboutthefunctionsoftrees.1.Whataretheytalkingabout?2.Whatcausesthiskindofbadweather?1cGrou
7、pworkDoyouknowhowsandstormscomeintobeing?Numberthepicturesandthentalkaboutthesandstormingroups.washtheearthawaymanytreeschangeintodesertsandstormscomeintoBeijingforestsgonecutdowntrees2GroupworkReadanddiscussdifferentwaysofprotectingandsavingwater.Prot
8、ectingandSavingWaterWaterisveryimportanttohumanbeings,butnoteverybodyknowshowtoprotectandsaveit.Herearesomeways:1.Passlawsagainstwaterpollution.2.Stopfactoriespouringwastewaterintorivers.3.Remembertoturnthetopoffwhenyouleave.4.Collectan
