冀教版八下Unit 7 Know Our World Lesson 38 The World Is a Big Place课件

Unit7TheWorldIsaBigPlaceLesson38 Thinkaboutit!•Howmanycontinentsarethereintheworld?Whatarethey?•Whatdoyouknowabouttheplacewhereyoulive? Howmanycontinentsarethereintheworld?Whatarethey? AfricaAsiaEuropeOceaniaAntarcticaSevenContinentsNorthAmericaSouthAmerica ThePacificOceanTheIndianOceanTheAtlanticOceanTheArcticOceanOceanscoveraboutthree-quartersoftheearth’ssurface. desertDesertscovertwentypercentoftheearth’ssurface. What’stheworld’sbiggestisland?Theworld’sbiggestislandisGreenland.GreenlandisnortheastofCanada.Greenland Words&expressions Listenandread.Theearthisaveryspecialplanet,anditfacesabigproblem.Intheyear2010,theworld’spopulationwasover7billionintotal.Itisincreasingveryquickly.By2025,theworld mayhaveabout8billionpeople.Andby2050,theworld’spopulationmayreach9billion.Thereisanotherproblem.Peoplecan’tliveeverywhereontheearth.Wecan’tliveinwater,andonlyaboutonethirdofourplanetisland.Butpartsofthislandareverydry.Thesedryplacesarecalleddeserts.Someareashaveveryhighmountains.Othershavealotofsnowandice.Itisnoteasytoliveinthoseplaces. Therearesevencontinents:Asia,Africa,Australia,Antarctica,Europe,NorthAmericaandSouthAmerica.Antarcticaiscoveredwithsnowandiceallyearround.Luckily,peoplecanliveontheothersixcontinents.Onthesecontinents,therearegreenforests,freshwaterandrichlands.Oceanscovertwothirdsoftheearth’ssurface.Theearthhasonlyonebigocean,but weusethesenamesforitsdifferentparts:thePacificOcean,theIndianOcean,theAtlanticOceanandtheArcticOcean.ThePacificOceanisthelargestone.Theearthisourhomenow,anditwillbeourhomeinthefuture.Itmustbetreatedwellforourchildrenandforourchildren’schildren,too! Languagepoints Intheyear2010,theworld’spopulationwasover7billionintotal.在2010年，世界人口总数超过770亿。intotal=inall,意思是“总计，合计”。例如：Howmanysnakesintotal?一共有多少条蛇？Therearemorethan6000studentsinourschoolintotal.我们学校的学生总计达6000多。 2.Itisincreasingveryquickly.(世界人口)正在迅速增长。increase,动词，意思是“增加；增大；增长；增强；繁殖”，后接介词by表示“增加了……”接介词to表示“增加到……”。例如：Thepopulationhasincreasedfrom300000to70000000.人口己经从三十万增加到了七千万。Thecompanyhasincreasedthepriceofitscars.公司提高了汽车价格。 3.Andby2050,theworld’spopulationmayreach9billion.到2050年，世界人口总数可能会达到90亿。1)“by+时间”表示“到……为止”。例如：IpromiseI’llsendyoufeedbackbythisFriday.我保证在这个星期五前给你反馈。Wehadtogettherebyevening.我们最迟也要在傍晚到达那里。 2)reach在本句中的意思是“达到”。例如：We’retoldthefigurecouldreach100000nextyear.我们得知明年这一数字可能达到十万。Thisyearitmaynotreacheventhat.今年有可能还达不到这一水平。 4.Wecan’tliveinwater,andonlyaboutonethirdofourplanetisland.我们不能居住在水里，而全球只有三分之一的面积是陆地。1)onethirdofourplanet意思是“我们星球的三分之一”，onethird表示分数1/3。分数的表达方法比较常见的有：a)基本表达法:分子用基数词，分母用序数词，例如：1/5onefifth1/9oneninth b)如果分子大于1,分母要用序数词的复数形式,例如：2/5twofifths;7/9sevenninthsc)特殊分数表达法：half意思是“一半”，可以用来表示1/2; 2)quarter名词，意思是“一刻钟，四分之一”。例如：1/2onehalf1/4aquarter3/4threequartersHalfofusarefromNorthChina.我们当中有一半来自于华北地区。Aquarterofthestudentshavelefttheirpictureshome.四分之一的学生把照片落在家里了。 5.Antarcticaiscoveredwithsnowandiceallyeararound.北冰洋常年被冰雪覆盖。becoveredwith意思是“被所覆盖”。例如：Thefieldiscoveredwithsomanybeautifulflowers.田野被许多美丽的花儿所覆盖。 Readthelessonandmatcheachparagraphwithitsmainidea1Paragraph1Paragraph2Paragraph3Paragraph4Paragraph5a.Sixofthesevencontinentsaregoodforpeopletoliveon.b.Weshouldtreattheearthwell.c.Anincreasingpopulationisabigproblemfortheearth.d.Twothirdsoftheearthiscoveredwithoceans.e.Peoplecannotliveeverywhereintheearth. Fillintheblankswiththecorrectformsofthewordsinthebox.2Thenumberofswimmershereis_________quicklybecauseit’sveryhotthesedays.2.Theschoolhasa______of900students.3.Ithinkitmaybethe______seasonoftheyear.4.The_______ofourbodyisskin.Itprotectsus.5.Howmany_______ofpeoplearethereintheworldnow?increasedrysurfacebilliontotalincreasingtotaldriestsurfacebillions Matchthesevencontinentswiththeircorrectdescriptions.3 TimeforReflectionintotalonethirdbecoveredwith总计；合计；总共三分之一被……覆盖 Exercise I.Choosethebestanswers:BA()1.____ofthestudentsarefromthecountryside.A.ThirdquarterB.ThreequartersC.ThreequarterD.Thirdquarters()2.Aquarterofthestudents____lettheirbooksathome.A.areB.isC.haveD.has ()3.TheYellowRiveris______inChina.secondlongestriverthesecondlongestriverC.thesecondlongestriversD.thelongestriverB Theywillbethere_________________(在周末以前)._______________(四分之三)oftheapplesaregreen.3.Milk_____________(对……有益）yourhealth.4.Theworld_____________(由……组成）manydifferentkindsofplaces.bytheweekendThreequartersisgoodforismadeupofII.Fillintheblanks. III.Fillintheblanks.Therearecontinentsintheworld.Africa,,Australia,,NorthAmerica,andAntarctica.istheworld’scoldestcontinent.Therearefouroceans:,_______________,theIndianOceanand.Thebiggestislandintheworldis.Thelongestriverintheworldis.sevenAsiaEuropeSouthAmericaAntarcticathePacificOceantheAtlanticOceantheArcticOceanGreenlandtheNileRiver Searchmoreinformationabouttheknowledgeofourearthandsharewithyourpartners.Homework