Unit+2+Topic+2+Section+A 仁爱版九年级英语上册.pptx

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1、Unit 2 Saving the EarthTopic 2 Section A 学习目标学习目标预习检测预习检测知识梳理知识梳理课堂总结课堂总结学习导航重点探究重点探究当堂当堂检测检测新课导入新课导入Lets watch a video!学习目标学习目标能熟悉并正确运用本课时的重点单词和短语能熟悉并正确运用本课时的重点单词和短语12进一步了解有关环境污染的一些情况，提高环境保护意识1.Ericarrivedontime,_itwastherushhour.A.althoughB.becauseC.whileD.unless2._badweatheritis!Itisrainingcatsan

2、ddogs.A.WhataB.WhatC.HowD.Howa预习检测预习检测AB3._downtreesisharmfultohumanbeings,animalsandplants.A.CutB.CutsC.CuttingD.Cuting4.Allofusneedtodosomethinguseful_theenvironment.A.protectB.protects C.protecting D.toprotect5.Manyfansstill_forairporttoseetheirfavoritestar,althoughitiscoldoutside.A.leavingB.left

3、C.leaveD.leavesCDC知识梳理知识梳理Key points 1.What a strong wind!好大的风啊！What引导的感叹句：What+a/an+形容词+可数名词单数！（不可数名词如:news,advice,weather）eg:Whatabusyday!多么繁忙的一天呀！What+形容词+不可数名词/可数名词复数！eg:Whatcleanwater!多么清澈的水呀！Key points2.As a result,a lot of rich land changed into desert.结果，许多肥沃的土地已经变成了沙漠。changeinto（把变成）=turnin

4、toeg:PleasechangeEnglishintoChinese.请把英语变成汉语。Key points3.Trees can stop the wind from blowing the earth away.树可以防风固土。stopsb./sth.(from)doingsth.=preventsb./sth.(from)doingsth.=keepsb./sth.fromdoingsth.（from不能省略）阻止做某事 eg:Theheavyrainstopsusfromgoingout.=Theheavyrainpreventsusfromgoingout.=Theheavyrai

5、nkeepsusfromgoingout.大雨使我们无法外出。Key pointsearth着重指与天空相对的“土地”，还泛指泥土；soil主要指用于种植庄稼的“土壤”；ground主要指大地表面；land着重指与河、湖、海洋相对应的陆地。eg:Putthetreeintheholeandfillitwithearthagain.把树放进坑里，然后用土壤重新把坑填满。Fishcannotliveonland.鱼不能在陆地上生活。Thelittleboywaslyingontheground。小男孩躺在地上。Key points4.Although there were sandstorms b

6、efore,now we have built“The Great Wall”.虽然之前有沙尘暴，但现在我们已经建起了“绿色长城”，althoughconj.虽然，尽管，引导让步状语从句，相当于though,只是although比though更为正式。eg:Though/Althoughitwasraining,wewentthere.虽然下着雨，但我们还是去了那儿。Key points 注意：注意：在句中使用although或though时，不能与but同时使用,但although/though后可用yet或still等。加强语气时，通常说eventhough，而不能说evenalthoug

7、h。eg:Althoughthequestionisdifficult,hecanstillanswerit.尽管这个问题很难，他仍然能回答。探究一沙尘暴的形成及危害Lets see what happened to our earth!sandstorm1a Listen,look and say.(Kangkang,Maria and Jane are talking in a room.The wind outside is blowing strongly.)Maria:Whatastrongwind!Kangkang:Yes.Butitsbetterthanthelastfewyea

8、rs.Thereweresandstormsbefore.WhileIwaswalkingdownthestreet,Icouldntseeanything.Thesandreallyhurtmyface.Maria:Whywastheweathersobad?Jane:Peoplecutdowntoomanytrees.Asaresult,alotofrichlandchangedintodesert.Treescanstopthewindfromblowingtheearthaway.Kangkang:Andalotofwatercanbesavedbyforests.Jane:Trees

9、canalsostopthewaterfromwashingtheearthaway.Maria:Cuttingdownthetreesaffectstheweathersomuch.Kangkang:Yes.Itisharmfultohumanbeings,animalsandplants.Althoughthereweresandstormsbefore,nowwehavebuilt“TheGreenGreatWall”.Ourenvironmenthasbecomemuchbetter.1b Listen to 1a and choose the best answer.Theboyan

10、dgirlsaretalkingabout_.A.differenttypesofsandstormsB.thereasonsforsandstormsC.sandstormsindifferentcitiesFocus on the main idea of the conversation when you listen for the first time.1c Read 1a and complete trees functions.Trees functions A.B.A lot of water can be saved by forests.C.Trees can stop t

11、he wind from blowing the earth away.They can also stop the water from washing the earth away.Pair workAct out the dialog in pairs:K:wind;sand;anythingM:sandstormsJ:cutdown;asaresult;changeintoM:affectJ:stopfrom;blowawayK:canbesavedJ:washawayK:isharmfulto;although;dosomething1.Peoplehavecutdownsuchal

12、argenumberoftreesthattheland_desert.2.Therearefewertreesleft,sothewindalways_theearth_.3.Airpollutionhasbecomeaseriousproblem,sowemust_toreduceit.4.weshouldtryourbestto_people_cuttingdownthetrees.5.Inthefuture,humanbeingscanprotectthetreeswell._,animalswillliveahappylifeintheforest.2 Complete the se

13、ntences with the correct forms of the given phrases in the box.as a result,change into,do something,stop from,blow awaychangedintoblowsawaydosomethingstopfromAsaresult3 Do you know how sandstorms come into being?Number the pictures and talk about the sandstorm in groups.wash the earth awaymany trees

14、change into desertforests gonesandstorms come into beingcut down trees1234564 A.Listen to the passage and circle the phrases you hear.becomeweakerdestroytheenvironmentdisappearrapidlyontheearthenoughbambootoeatB.Listen again and fill in the blanks.1.Nowsomekindsofanimalsarebecoming_.2.Someanimalsare

15、_dyingoutcompletely.3.Inthepast,pandaslivedaquietlifeandhad_food.4.Humanshave_theimportanceofprotectinganimals.5.Weshould_toprotectthem.doourbestindangerofplentyofcometounderstandfewerandfewer小组讨论关于沙尘暴的信息小组讨论关于沙尘暴的信息,写一篇报告说明写一篇报告说明沙尘暴的形成过程。沙尘暴的形成过程。完成任务所需的句子结构:Manyyearsago,thereweremanytreesinthefor

16、est.Later,peoplecutdownmanytreesto.Thenforestshavegone.Heavyrainwashedtheearthaway.Manyrichlandschangedintodesert.Sandstormscameintobeing.Group work通过以上活动，我们可以知道：沙尘暴的形成是需要一定的过程的。过程如下：manytrees_forestsgonewashtheearthaway_sandstormscomeintobeing.当堂检测见当堂检测见DCFDCF课件课件活动小结活动小结cutdowntreeschangeintodeser

17、t 翻译。翻译。1.良田变沙漠。(changeinto)_2.树木可以阻止风把泥土吹走。(stopfrom)_3.砍树对人类有害。(cutdown,beharmfulto)_当堂检测当堂检测Richlandchangedintodesert.Treescanstopwindfromblowingtheearthaway.Cuttingdowntreesisharmfultohumanbeings.SummaryUnit 2Topic 2 Section A重点单词短语句型：although;changeinto;stopsb./sth.(from)doingsth.What引导的感叹句：What+形容词+不可数名词/可数名词复数！What+a/an+形容词+可数名词单数！进一步了解有关环境污染的一些情况，提高环境保护意识