【答案解析】[听力原文] {{B}} Television{{/B}} Television, although not essential, has become an important part of most people's lives. / It alters people's ways of seeing the world; / in many ways, it supports and sustains modern life. / Television has become a baby-sitter, an introducer of conversations, / the major transmitter of culture, a keeper of tradition. / Yet what can be seen on TV in one day is critically analyzed. / It becomes evident that television is not a reader but a sustainer; / the poor quality of programmers does not elevate people into greater understanding, / but rather maintains and encourages the life as it exists. / The primary reason for the lack of quality in American television/is related to both the history of TV program development and the economics of TV. /The close relationship which the advertisers had with radio programs/ became the system for American TV. / Sponsors not only paid money for time within programs, /but many actually produced the programs.