telephones高一英语课件
日期：2010-05-26 05:49
ModernTelephonesModernTelephonesAnswerthefollowingquestions:AaHowmanypartscanthetextbedividedinto?bCanyoufindoutthetopicsentenceofeachparagraph?Whatarethey?TelephoneTelephoneSwitchHowaTelephoneWorksTodayBaHowwasonetelephoneconnectedwithanotherinthepast?bHowisonetelephoneconnectedwithanothertoday?DWhenmakingatelephonecalltoday，whichstepiscorrect?aVoice---electricalsignals---lightsignals---electricalsignals---soundbvoice---electricalsignals---voicecvoice---lightsignals–voicedlightsignals---electricalsignals---voiceEWhenyouspeakintothetelephone，thewavesofyourvoiceareturnedinto____alightsignalsbelectricalsignalscsoundsignalsdSoundF____canbeusedtosendtelephonesignalsoverlongdistancesbysatellite?aVoicewavesbRadiowavescElectricalsignalsdSoundsignalsGTheserviceoftheredirectionmakessurethat____ayoucanreceivecallswhereveryouareballthetelephonecallcanbereceivedbyyoursecretaryc，
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