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大学英语四级阅读理解练习题及答案,
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 you go into the details， the t， 大小：2.28 MB