1、语言知识
双基词汇：有关技术的词汇---audio device, wireless, broadcasting, cable TV, Web TV, set-top box, World Wide Web, recorder, electric current, cassette, CD, Discman, Mini Disc
其他词汇--- in color, be superior to, come onto the market, wind up, demand, spring up, a variety
语用功能：被动结构（科技文章中常用被动语态）
介词用法复习、归纳
重点句型：L11-L12 It took more than two decades…for color broadcasts to…
L16-L17 It took 50 years before….
L54 since-clause
