Lesson38TheWorldIsaBigPlace.ppt

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1、Unit7KnowOurWorldpollutionsTheincreasingpopulation.Lesson38:TheWorldIsaBigPlace!学习目标1.我要掌握单词和短语：planet,billion,total---;intotal,onethird2.通过学习我要掌握分数的表示方法。自学检测I.用所给词的适当形式填空。1．(billion)ofstarstwinkledinthesky.2．Thenumberofthestudentsinourschoolis(increase)．3．(planet)goaroundthesun.4．(In

2、dian)haswitnessedmanypoliticalchangesinrecentyears.BillionsincreasingPlanetsIndiaII.写出下列画线短语的汉语意思。1．Canyoupointthemout?2．Intheyear2010，theworld'spopulationwasover7billionintotal.3．Wecan'tliveinwater，andonlyaboutonethirdofourplanetisland.4．Antarcticaiscoveredwithsnowandiceallyearround.

3、5．Oceanscovertwothirdsoftheearth'ssurface.指出，说明总计，总共，合计三分之一被…覆盖三分之二课堂探究1.Howmanycontinentsarethereintheworld?Whatarethey?Therearesevencontinents:Asia,Africa,Australia,Antarctica,Europe,NorthAmericaandSouthAmerica.2.Howmanypeoplearethereintheworld?Over7billionintotal.3.Howmanypeoplewil

4、ltherebeintheworldby2025?About8billionpeople.4.Wheredoallthepeoplelive?Onland.5.Howbigaretheworld’soceans?Oceanscovertwothirdsoftheearth’ssurface.6.Howmanyoceansdoestheworldhave?Onlyonebigocean.7.Whichcontinentisnotfitforhumanlife?Antarctica.1.你能指出它们吗？Canyoupointthemout？2．在2010年，世界人口的

5、总数超过了70亿。Intheyear2010，theworld'spopulationwasover7billionintotal.3．这些干燥的地方叫作沙漠。Thesedryplacesarecalleddeserts.4．南极洲终年被冰雪覆盖。Antarcticaiscoveredwithsnowandiceallyearround.TranslatethefollowingpassageintoChinese.①Thisistheearth.Thegreenpartisland.Thebluepartissea.Thewhitepartisclouds.②O

6、urearthisverybeautifulandinteresting.Therearerivers,streams,seasandlakes.③Therearehillsandmountains.Therearejunglesandforests.Therearemanycountriesandcities.④Therearemanypeopleliveinthem.Doyouthinktheearthisverywonderful?⑤Manyyearsago,theearthisveryclean.Butnowadaysthereismuchpollutio

7、nontheearth.⑥Thereisairpollution,landpollutionandwaterpollution.Peoplearecuttingdowntheforests.⑦Manywildanimals,birdsandinsectslosetheirhomes.It'sverycruel.⑧Peoplearepollutingtheland,thewaterandtheair.Peoplemuststopdoingthis.⑨Wemustsavetheearth.Wemustsaveourhome.小溪灌木丛昆虫残忍Let’sprotecto

8、urhom