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白银十中辛军峰Lesson50TheWorldIsaBigPlace!教学目标1.认识七大洲，四大洋的英文名称；2.学会小数和分数的部分表达法；3.了解更多的世界地理知识。教学难点1.大洲大洋的表达法；2.分数小数的表达法。北南AsiaEuropeAfricaNorthAmericaSouthAmericaAustraliaAntarcticacontinentsoceans太平洋印度洋北冰洋大西洋大西洋ThePacificOceanTheIndianOceanTheArcticOceanTheAtlanticOceanLookandsay1234567ABCCDB.swf1.Howmanypeoplearethereintheworld?2.Wheredoallthepeoplelive?3.Howbigaretheworld’soceans?4.Howmanydesertsdoestheworldhave?5.What’stheworld’sbiggestisland?6.What’stheworld’slongestriver?Listentothetapeandanswerthequestions:AboutsixbillionOnland.Oceanscoveraboutthree-quartersoftheearth’ssurface.20percent.Greenland.TheNileRiver.Readandfinishtheexercises:1.Scientistspredicttheworld’spopulationwillhave_______By2025,therewillbe9.1billionpeopleby_______.2.About_________oftheworldisland.Thelandthatisvery____iscalleddesert.Thedesertscover________________oftheearth’ssurface.3.Thereare______continents.Theyare_____,______,________,________,NorthAmerica,SouthAmericaandAntarctica.Antarcticaisworld’s________andtheworld’s________continent.4.Thereare_____mainoceans.Theycover____________oftheearth’ssurface.Theyarethe_____________,the________________,the_______________andtheArcticOcean.The______________isthebiggestocean.The_______________isthesmallestocean.5.Theworld’sbiggestislandis_____________.6.TheNileRiverinAfricaisthe_________river.7.8billion2050one-thirddrytwentypercentofsevenAfricaAsiaAustraliaEuropecoldestdriestfourthree-quartersPacificOceanAtlanticOceanIndianOceanPacificOceanAtlanticOceanGreenlandlongestLearningTips1.populationn.人口What’sthepopulationoftheworld?=Howmanypeoplearethereintheworld?2.Increasev.增加、增大、增强increaseby增加了……increaseto增加到……3.分数的表达法1/2onehalf=onesecond1/4aquarter=onefourth2/5twofifths3/7threeseventh分子用基数，分母用序数；分子大于1，分母加s.4.小数的读法point3.454.680.36threepointfourfivefourpointsixeightpointthreesixKnowledgeaboutcontinentsandoceans:Doyouknowthesevencontinentsintheworld?_____isthebiggestcontinent.IthasthehighestpointontheEarthintheHimalayasMountains.ThispointiscalledMountEverest.______isthesecondlargestcontinent.Elephants,giraffes,zebras,andlionslivetherebothinthejunglesandinthedesert.______________isthethirdlargestcontinent.Canada,MexicoandtheUnitedStatesarethethreemajorcountriesonthiscontinent.AsiaAfricaNorthAmerica_____________isthefourthlargestcontinent.Thereare13countriesonthiscontinent.___________islocatedattheSouthPole.Itisthefifthlargestcontinent.Therearebeautifulpenguins._______isthesixthlargestcontinent.Itisagoodplaceforpeopletotravelto.________isthesmallestcontinent.Ontheearththerearefouroceans.Youcanseewatereverywhere._____________isthebiggest._____________isthesecondlargestocean.Then_____________andtheArcticaretheoceansthirdandfourthinsize.SouthAmericaAntarcticaEuropeAustraliaThePacificTheAtlantictheIndianHomework1.阅读课文，默写本课的新词；2.将本单元关于亚洲、欧洲、北美洲的课文读一读；3.继续搜集有关地里的知识。Seeyou!