Unit2SavingtheEarthTopic2Alltheseproblemsareveryserious.SectionBSectionBWhichcolordoyoulikebest?Why?Whichcolorcanmakeyouthemostrelaxed?Whatcantreesdoforus?Whatcantreesdoforus?OurlifeOurenvironmentWhatwillourworldbelikewithouttrees?Whatwillourworldbelikewithouttrees?sandstormdeserthumanbeingsWhatshouldwedo?Weshouldstopcuttingdowntrees.Weshouldpreventpeoplefromcuttingdowntrees.Listento1a,answerthequestions.Whataretheytalkingabout?Whatcausesthiskindofbadweather?Theyaretalkingaboutsandstorms.Peoplehavecutdowntoomanytrees.Alotofrichlandhaschangedintodesert.（录音p35-1a）Read1a,answerthequestion.Whataretrees’functions?Treescanstopthewindfromblowingtheearthaway.Alotofwatercanbesavedbyforests.Treescanalsopreventthewaterfromwashingtheearthaway.A.B.C.Lookatthepicture,describethemusingthewordsgiven.washtheearthawaymanytreeschangeintodesertforestsgonesandstormscomeintobeingcutdowntreesNumberthepicturesandthentalkaboutthemingroups.()()()()()()()()()()()()Doyouknowhowsandstormscomeintobeing?415362Treesareveryusefultous.Theycanhelpusp_______thewindfromblowingtheearthawayandstopthes_______frommovingtowardstherichland.Treesalsos________waterfromrunningaway.Theycankeepagreatd______ofwater.Sowemuststoppeoplefromc______downtoomanytrees.Otherwisealotofrichlandwillchangeintod_______,l_______onlysand.Wemustgetridof(摆脱)thiskindofbadb______.根据句意及首字母提示完成句子。根据句意及首字母提示完成句子。reventandaveealuttingeserteavingehaviorTreesareimportanttous,whatcanwedotoprotectthem?•Weshouldpreventpeoplefrom…ProtectingandSavingWaterWaterisveryimportanttohumanbeings,butnoteverybodyknowshowtoprotectandsaveit.Herearesomeways:1.Passlawsagainstwaterpollution.2.Stopfactoriespouringwastewaterintorivers.3.Remembertoturnthetapoffwhenyouleave.4.Collectandreusewastewater....UsefulexpressionsUsefulexpressionsThewindisblowingstronglywithlotsofsand.Peoplehavecutdowntoomanytrees.Alotofrichlandhaschangedintodesert.Andalotofwatercanbesavedbyforests.Theycanalsopreventthewaterfromwashingtheearthaway.Stopfactoriesfrompouringwastewaterintorivers.Bye-bye!Bye-bye!
