unit16课件
日期：2010-07-22 07:43
inventor，writer，andscientist(1706-1790)BenjaminFranklinwroteanewspaperBenjaminFranklininventedawoodstoveBenjaminFranklinprovedthatlightningwasaformofelectricitybyperforminghisfamousexperimentwithakiteandakeyBenjaminFranklinhelpedAmericawinTheRevolutionaryWar1Before1752scientistsalreadyknewwhatelectricityis2Franklinwashelpedbyafriendtodotheexperiment3Franklinmadethekiteofsilkbecausewetsilkdoesnotconductelectricity4Acondenserwasusedintheexperimenttostoreelectricity5ThekeytiedtothestringwasputintothedoortostopthekiteflyingawayFFFTFKiteExperimentToshowthatlightningandelectricityarethesameInJune1752Thestringwasgettingcharged，Americanstatesman，“I”collectandstoreagreatdealofelectricityinthecondenserSkimming:ReadthepassagefasttofindouttherightpictureaboutFranklin’sexperimentThemainideaofeachpartPart1(Para1-2):Franklindidtheexperimentinorderto____________________________________________________________Part2(Para3):Istheexperimentsuccessfulornot?prove，
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