Unit2SavingtheEarthTopic2Pollutionhascausedtoomanyproblems.SectionALanguagegoalsBytheendoftheclass,youwillbeableto1.Masterthefollowingwords,phrasesandsentences:Words：

sand,althoughPhrases:

changeinto,humanbeingSentences：①Asaresult,alotofrichlandhaschangedintodesert.

②Treescanstopthewindfromblowingtheearthaway.2.Knowhowsandstormscomeintobeing.3.Beabletousetheindefinitepronounscorrectly.Revision：一般過去時和現(xiàn)在完成時的用法區(qū)別一般過去時現(xiàn)在完成時用法連用的詞和短語表示過去發(fā)生或已完成的動作對現(xiàn)在的影響或產(chǎn)生的結(jié)果（與現(xiàn)在無關(guān)）表示過去發(fā)生的動作或存在的狀態(tài)（與現(xiàn)在無關(guān)）yesterday,last+時間名詞,時間段+ago,in2005,inthepast,justnow…

for+時間段,since,recently,sofar,already,yet,just,ever,never,beforeinthepast+時間段,

Lookandsay

4.Asaresult,sandstorm

comeintobeing.comeintobeing

形成產(chǎn)生

Workon3washtheearthawaymanytreeschangeintodesertforestsgonesandstormscomeintobeingcutdowntreesDoyouknowhowsandstormscomeintobeing?Numberthepicturesandtalkaboutthesandstormingroups.()()()()()()415362washtheearthawaymanytreeschangeintodesertforestsgonesandstormscomeintobeingcutdowntrees

Longago,therewerelotsoftreesandforests.Buthumanbeingsneededsomewoodtobuildhousesanddootherthings,sotheycutdownthetreesdaybyday.Theforestshavegone.Therainwashedtheearthaway.Alotofrichlandhaschangedintodesert.Asaresult,thesandstormscomeintobeing.

Listento1aandchoosethebestanswer.Theboyandgirlsaretalkingabout

.differenttypesofsandstormsthereasonsforsandstormssandstormsindifferentcitiesFocusonthemainideaoftheconversationwhenyoulistenforthefirsttime.

Read1aandcompletetrees’functions.Tree’sfunctions

________________________________Alotofwatercanbesavedbyforests.________________________________Treescanstopthewindfromblowingtheearthaway.Theycanalsostopthewaterfrom

washingtheearthaway.1.Theboyandgirlsaretalkingabout___________.differenttypesofsandstormsthereasonsforsandstormssandstormsindifferentcities2.What’stheweatherliketoday?

3.Whatcausesthesesandstorms?

4.Dowestillneedtodosomethingtoprotecttheenvironment?

choosethebestanswer.BIt’sbad.Thewindissostrong.Andthesandreallyhurtsface.Peoplehavecutdowntoomanytrees.Asaresult,alotofrichlandhaschangedintodesert.Yes,wedo.Althoughwehavebuilt“TheGreenGreatWall”,westillneedtodosomethingtoprotecttheenvironment.1.Asaresult,alotofrichlandhaschangedintodesert.changeinto意為“轉(zhuǎn)換成、變成”考點(diǎn)毛毛蟲長大后會變成美麗的蝴蝶。______________________________________________________________________________.翻譯Caterpillarswillchangeintobeautifulbutterflieswhentheygrowup.(Kangkang,MariaandJanearetalkinginaroom.Thewind

outsideisblowingstrongly.)

Maria:Whatastrongwind!Kangkang:Yes.Butit'sbetterthanthelastfewyears.Thereweresandstormsbefore.WhileIwaswalkingdown

thestreet,Icouldn'tseeanything.Thesandreallyhurt

myface.

Maria:Whywastheweathersobad?Jane:Peoplecutdowntoomanytrees.Asaresult,alotof

richlandchangedintodesert.Treescan

stopthewindfromblowingtheearthaway.It’sadesert.

n.沙漠Peopledesertedthehouses.v.廢棄，遺棄→Wecanchange

grapesinto

thewine.Alotofrichlandhaschangedintodesert.→轉(zhuǎn)換成，變成PresentationListento1aandchoosethebestanswer.Theboyandgirlsaretalkingabout______.A.differenttypesofsandstormsB.thereasonsforsandstormsC.sandstormsindifferentcitiesBKangkang:Andalotofwatercanbesavedbyforests.Jane:Treescanalsostopthewaterfromwashingthe

earthaway.Maria:Cuttingdowntreesaffectstheweathersomuch.Kangkang:Yes.Itisharmfultohumanbeings,animalsand

plants.Althoughthereweresandstormsbefore,nowwehavebuilt"TheGreenGreatWall".Our

environmenthasbecomemuchbetter.Read1aandcompletetrees’functionsTreescanstopthewindfromblowingtheearthaway.Treescanalsostopthewaterfromwashingtheearthaway.前幾年

沿著街道走

砍伐結(jié)果阻止...干某事沖走刮走

對...有害Readthepassageandfindtheusefulphrases.thelastfewyearswalkalongthestreetcutdownasaresultstop/prevent/keep...fromdoingsth.wash...awayblow...awaybeharmfulto...=doharmto...thelastfewyearsasaresultblow...awaywash...awaycutdownbeharmfulto=doharmtostop/prevent/keep...fromdoingsthwalkalongthestreetActivity2:單詞閃現(xiàn)，快讀快譯。單詞閃現(xiàn)，快讀快譯。Consolidation●Listenandrepeat●Workingroupsandread1ainroles.Role-playRole-playtheconversation.Althoughthereweresandstormsbefore,nowwehavebuilt“TheGreatWall”.雖然之前有沙塵暴，但現(xiàn)在我們已經(jīng)建起了“綠色長城”，although

conj.雖然，盡管，引導(dǎo)讓步狀語從句，相當(dāng)于though,只是although比though更為正式。eg:Though/Althoughitwasraining,wewentthere.雖然下著雨，但我們還是去了那兒。

earth著重指與天空相對的“土地”，還泛指泥土；soil主要指用于種植莊稼的“土壤”；ground主要指大地表面；land著重指與河、湖、海洋相對應(yīng)的陸地。eg:Putthetreeintheholeandfillitwithearthagain.把樹放進(jìn)坑里，然后用土壤重新把坑填滿。Fishcannotliveonland.魚不能在陸地上生活。Thelittleboywaslyingontheground。小男孩正躺在地上。Listentothetapeandnumberthepictures.DECBAParticipatoryLearningReadthetapeandfinishthethinkingmap.Treescanstopthewindfromblowingtheearthaway.stopthewaterfromwashingtheearthaway.savealotofwater注意：在句中使用although或though時,不能與but同時使用,但although/though后可用yet或still等。加強(qiáng)語氣時，通常說eventhough，而不能說evenalthough。eg:Althoughthequestionisdifficult,hecanstillanswerit.盡管這個問題很難，他仍然能回答。Retellthetrees`functionstoyourpartneraccordingtothethinkingmap.Youcandoitlikethis:Treescanstop....Treesalsocansave....What`smore,treescanprevent....Readthetapeagainandanswerthefollowingquestions.1.Whatwastheweatherlikebefore?2.Whywastheweathersobad?3.Howdoescuttingdowntreesdoharmtous?4.Howisthesituationnow?Thereweresandstorms.Whenpeoplewerewakingalongthestreet,theycouldn`tseeanything.Peoplecutdowntoomanytrees.Asaresult,alotofrichlandchangedinto