2016年下半年英语六级口语练习美文背诵(2)

　　Television

　　Television-----the most pervasive and persuasive of modern technologies, marked byrapid change and growth-is moving into a new era, an era of extraordinary sophisticationand versatility, which promises to reshape our lives and our world. It is an electronic revolutionof sorts, made possible by the marriage of television and computer technologies.

　　The word "television", derived from its Greek (tele: distant) and Latin (visio: sight) roots, can literally be interpreted as sight from a distance. Very simply put, it works in this way: through a sophisticated system of electronics, television provides the capability of convertingan image (focused on a special photoconductive plate within a camera) into electronic impulses, which can be sent through a wire or cable. These impulses, when fed into a receiver (televisionset), can then be electronically reconstituted into that same image.

　　Television is more than just an electronic system, however. It is a means of expression, aswell as a vehicle for communication, and as such becomes a powerful tool for reaching otherhuman beings.

　　The field of television can be divided into two categories determined by its means oftransmission. First, there is broadcast television, which reaches the masses through broad-based airwave transmission of television signals. Second, there is nonbroadcast television, whichprovides for the needs of individuals or specific interest groups through controlledtransmission techniques.

　　Traditionally, television has been a medium of the masses. We are most familiar withbroadcast television because it has been with us for about thirty-seven years in a form similar towhat exists today. During those years, it has been controlled, for the most part, by thebroadcast networks, ABC, NBC, and CBS, who have been the major purveyors of news, information, and entertainment. These giants of broadcasting have actually shaped not onlytelevision but our perception of it as well. We have come to look upon the picture tube as asource of entertainment, placing our role in this dynamic medium as the passive viewer.