牛津译林版九年级英语下册同步教学unit2 great people 第4课时1.ppt

Nothing?in?life?is?to?be?feared.?It?is?only?to?be?understood.?生活中没有可怕的东西,只有应去了解的东西。——Marie?Curie镭是一种放射性元素,元素名来源于拉丁文,原意是“射线”。1898年居里夫妇从沥青铀矿矿渣中发现了镭,1902年分离出90毫克氯化镭,初步测定了镭的原子量。镭在自然界分布很广,但含量极微。镭具有很强的放射性,并能不断放出大量的热。镭放出的射线能破坏、杀死细胞和细菌。因此,常用来治疗癌症等。镭是现代核工业兴起前最重要的放射性物质,到1975年为止,全世界共生产了约4千克镭,其中85%用于医疗,10%用来制造发光粉。镭是剧毒物质。BrainstormSpeakup:Whydoyouadmireher?ListentoPartBWriteaconversationaboutyourfavouritefamouspeople.Whodoyouthinkisthegreatestpersonthathaseverlived?Whatdidhe/shedo?Whydoyouadmirehim/her?SampleConversationS1:Whodoyouthinkisthegreatestpersoninhistory?S2:ThomasEdison!Iadmirehimthemost.S1:WhatdidThomasEdisondo?S2:Hecreatedover1,000inventionsforourmankind.S1:Whydoyouadmirehim?S2:Becausehewasaveryprofessionalpersonwhodevotedhiswholelifetocreating.Whataboutyou?Doyouadmiresomebody?Page?**1.Whodoyouthinkisthegreatestpersonthathaseverlived?2.Whatdidhe/shedo?ThomasEdisonChristopherColumbusWilliamShakespeareNelsonMandelaQianXuesenPeterTchaikovsky1.Whatothergreatpersonsdoyouknow?2.Doyouknowthewomaninthenextpicture?3.Haveadiscussionaboutherwithyourpartner.X-rayX-raymachineThecontributiontothemedicalscienceReadtheinformationofMarieCurie.MarieCurie(1867-1934)borninthecityofWarsaw,PolandmovedtoParis,Francewhenshewas24studiedMathematicsandPhysicsatauniversitymarriedaFrenchscientistcalledPierreCuriein1895discoveredradiumintheirlaboratoryin1898wontheNobelPrizetwiceduringherlifetimediedattheageof67WherewasMarieCurieborn?WhatdidshestudyinFrance?Whatweresheandherhusbandfamousfor?4.HowmanytimesdidshewintheNobelPrize?AnswerthequestionsaccordingtothenotesofMarieCurie.InthecityofWarsaw,Poland.MathematicsandPhysics.Thediscoveryofradium.Twice.Name:MarieCur