Unit 7 Know Our World Lesson 38 示范公开课教学课件 (八下翼教版)

Unit7Lesson38TheWorldIsaBigPlaceThinkaboutit!•Howmanycontinentsarethereintheworld?

Whatarethey?•Whatdoyouknowabouttheplacewhereyoulive?Warm-upHowmanycontinentsarethereintheworld?Whatarethey?PresentationLookandlearnAfricaAsiaEuropeOceaniaAntarcticaSevenContinentsNorthAmericaSouthAmericaPresentationThePacificOceanTheIndianOceanTheAtlanticOceanTheArcticOceanOceanscoveraboutthree-quartersoftheearth’ssurface.PresentationThePacificOceandesertDesertscovertwentypercentoftheearth’ssurface.PresentationWhat’stheworld’sbiggestisland?

Theworld’sbiggestislandisGreenland.GreenlandistothenortheastofCanada.GreenlandPresentationWords&expressionsPresentationplanetn.

行星billionn.

十亿；千兆totaln.

总计；总数

adj.

总的；总计的increasev.增加；增大surfacen.

表面；表层Indianadj.

印度的

n.印度人Atlantic

n.&adj.大西洋（的）Arctic

adj.北极的PresentationReadthelessonandmatcheachparagraphwithitsmainidea.Paragraph1Paragraph2Paragraph3Paragraph4Paragraph5a.Sixofthesevencontinentsaregoodforpeopletoliveon.b.Weshould

treattheearthwell.c.Anincreasingpopulationisabigproblemfortheearth.d.Twothirdsoftheearthiscoveredwithoceans.e.Peoplecannotliveeverywhereontheearth.Readthepassageloudly.Theearthisaveryspecialplanet,anditfacesabigproblem.Intheyear2010,theworld’spopulationwasover7billionintotal.Itisincreasingveryquickly.By2025,theworldmayhavePresentationabout8billionpeople.Andby2050,theworld’spopulationmayreach9billion.Thereisanotherproblem.Peoplecan’tliveeverywhereontheearth.Wecan’tliveinwater,andonlyaboutonethirdofourplanetisland.Butpartsofthislandareverydry.Thesedryplacesarecalleddeserts.Someareashaveveryhighmountains.Othershavealotofsnowandice.Itisnoteasytoliveinthoseplaces.Presentation

Therearesevencontinents:Asia,Africa,Australia,Antarctica,Europe,NorthAmericaandSouthAmerica.Antarcticaiscoveredwithsnowandiceallyearround.Luckily,peoplecanliveontheothersixcontinents.Onthesecontinents,therearegreenforests,freshwaterandrichlands.Oceanscovertwothirdsoftheearth’ssurface.Theearthhasonlyonebigocean,butweusethesenamesforitsdifferentparts:PresentationthePacificOcean,theIndianOcean,theAtlanticOceanandtheArcticOcean.ThePacificOceanisthelargestone.

Theearthisourhomenow,anditwillbeourhomeinthefuture.Itmustbetreatedwellforourchildrenandforourchildren’schildren,too!PresentationLanguagepoints1.Canyoupointthemout?pointv.指，指向。常用短语：pointat指着；pointout指出，说明。e.g.Hepointedoutthedangersofdrivingalone.他指出了单独开车的危险性。Canyoupointoutthemistakesinthispicture?

你能指出这张图片中的错误吗？Languagepoints2.Theearthisaveryspecialplanet,anditfacesabigproblem.

facev.面临；面对。它在此作及物动词，后面可接人或表示困难、形势、问题等的抽象名词或动名词作宾语。e.g.Youshouldfacethechallengebravely.你应该勇敢地面对挑战。Languagepoints3.Intheyear2010,theworld’spopulationwasover7billionintotal.

billionn.

十亿。其复数形式为billions。当其前有具体的数词时，用单数形式，表示确数；当其前没有数词或由some,several,many等词修饰时，用复数形式，且其后要接介词of，表示概数。类似用法的词还有:hundred（百）,thousand（千）,million（百万）等。e.g.Thiscompanyearnstwobilliondollarsayear.这家公司一年要赚20亿美元。Billionsofstarstwinkledinthesky.无数的星星在天空中闪烁。Languagepoints(2)intotal意为“总计，合计，总共”,相当于inall。

atotalof…总数为……e.g.Hissisterhasthreehundredstampsintotal.

他的姐姐总共有三百张邮票。Ourclass