unit161高一英语课件
日期：2010-11-27 11:19
nomodernlifeWhodiscoveredelectricity?BenjaminFranklin(1706-1790)printerdiplomat(外交官)statesman(政治家)philosopher(哲学家)inventorscientistHowdidhediscoverelectricity?BenjaminFranklindiscoveredelectricitybydoing/conductingakiteexperimentthingsweneedakitebadweather(thunderstorm)akeyacondenserashedasmallcrossahandkerchiefaddatailfixasharppieceofmetalfastenakeytieasilkribbontiealongstringReadthefollowingstatementsanddecideiftheyareTorFIn1752scientistsalreadyknewwhatelectricityisFranklinwashelpedbyafriendtodotheexperimentFranklinmadethekiteofsilkbecausewetsilkdoesnotconductelectricityAcondenserwasusedintheexperimenttostoreelectricityThekeytiedtothestringwasputintothedoortostopthekitefromflyingawayTFTFF1Beforehisexperiment，Unit16ScientistsatworkAlbertEinsteinThetheoryofrelativityThomasEdisonThelightbulbNewtonGravityTheyallneedelectricityNoelectricity，FranklinhadtopreparethefollowingEXCEPT________A:astrongkiteB:reallybadweatherC:ametal，
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