标签：英语四级试题下载,大学英语四级试题,英语四级真题下载,, 2017年英语四级阅读理解练习及解析(一),
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Videoconferencing is nothing more than a television set or PC monitor with a camera Through the videocenferencing， not only your voice but also your face， the surroundings and any other graphic and phisical __1__ can be captured and transmitted through the communication system with or without wires. Of course， when， 大小：9.19 MB