Unit7Lesson38TheWorldIsaBigPlaceThinkaboutit!?Howmanycontinentsarethereintheworld?

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

Theworld’sbiggestislandisGreenland.GreenlandistothenortheastofCanada.GreenlandPresentationWords&expressionsPresentationplanetn.

行星billionn.

十億；千兆totaln.

總計(jì)；總數(shù)

adj.

總的；總計(jì)的increasev.增加；增大surfacen.

表面；表層Indianadj.

印度的

n.印度人Atlantic

n.&adj.大西洋（的）Arctic

adj.北極的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。常用短語(yǔ)：pointat指著；pointout指出，說(shuō)明。e.g.Hepointedoutthedangersofdrivingalone.他指出了單獨(dú)開車的危險(xiǎn)性。Canyoupointoutthemistakesinthispicture?

你能指出這張圖片中的錯(cuò)誤嗎？Languagepoints2.Theearthisaveryspecialplanet,anditfacesabigproblem.

facev.面臨；面對(duì)。它在此作及物動(dòng)詞，后面可接人或表示困難、形勢(shì)、問(wèn)題等的抽象名詞或動(dòng)名詞作賓語(yǔ)。e.g.Youshouldfacethechallengebravely.你應(yīng)該勇敢地面對(duì)挑戰(zhàn)。Languagepoints3.Intheyear2010,theworld’spopulationwasover7billionintotal.

billionn.

十億。其復(fù)數(shù)形式為billions。當(dāng)其前有具體的數(shù)詞時(shí)，用單數(shù)形式，表示確數(shù)；當(dāng)其前沒(méi)有數(shù)詞或由some,several,many等詞修飾時(shí)，用復(fù)數(shù)形式，且其后要接介詞of，表示概數(shù)。類似用法的詞還有:hundred（百）,thousand（千）,million（百萬(wàn)）等。e.g.Thiscompanyearnstwobilliondollarsayear.這家公司一年要賺20億美元。Billionsofstarstwinkledinthesky.無(wú)數(shù)的星星在天空中閃爍。Languagepoints(2)intotal意為“總計(jì)，合計(jì)，總共”,相當(dāng)于inall。

atotalof…總數(shù)為……e.g.Hissisterhasthreehundredstampsintotal.

他的姐姐總共有三百?gòu)堗]票。Ourclass