unit12reading课件
日期：2010-06-23 06:52
peoplehadnoideawhattheinsideoftheearthmightlooklikeCanyouexplainwhatweknowaboutittoday?Layersbeneaththeearth’ssurfaceWhatdoestheinsideoftheearthlooklike?剖面图Theearthonwhichweliveisabigballofveryhotrock，Unit12FactandFantacyReading1Whendoyouthinktheinventionsinthefollowingthreepicturesweremade?PRE-READINGThefirstelectricrailwaywasbuiltbytheGermanWernervonSiemensin1879Picture1: Picture2:wasinventedin1879byThomasEdisonintheUnitedStatesTheelectriclightbulbPicture3:In1769JamesWattbuilt asteam-poweredboat2Whenwaselectricitydiscovered?In1600byGilbert3Doyouknowthescientistandtheapplicationofelectricityoveraperiodof200years?scientistinvention1844–Morse:theradio1876–Bell:theelectricbattery1821–Faraday:theelectricmotor1752-Franklin:thetelegraph1904–Tesla:thetelevision1928–Farnsworth:thelighteningrod1800–Volta:thetelephoneyear4Intheearly19thcentury，whichconsistsofthreeparts:theearth’scrust，t，
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