telephones高二英语课件
日期：2010-12-08 12:38
thewavesofyourvoiceareturnedinto____AelectricalsoundsBelectricalsignalsClightsignals2Thehandleofanoldtelephonewasusedfor______AproducingenoughelectricitytomakeacallBconnectingwithanothertelephoneCgettingbetterelectricalsignals3Thejobofanoperatoris_____AtowindthehandleforcustomersandchargethephonecallsBtoconnectthetwonumber，Unit23TelephonesChoosethebestanswers1Whenyouspeakintothetelephone，totimeandchargethephonecallsCtomendtelephonesandtelephonewires4____canbeusedtosendtelephonesignalsoverlongdistancesbysatelliteASoundwavesBWaterwavesCradiowaves5_____makesitpossibleforpeopleatdifferentplacestohearoneanotherspeakARedirectionBConferencemeetingCCallwaiting6Theserviceofredirectionmakessurethat______AyoucanreceivecallswhereveryouareBallthetelephonecallscanbereceivedbyyoursecretaryCtelephonecallscanberecordedifyouarenotatyourofficeSomeearliesttelephonesthe，
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