托福写作高分范文：电视
Television-----the most pervasive and persuasive of modern technologies,marked by rapid change and growth-is moving into a new era, an era of
extraordinary sophistication and versatility, which promises to reshape our
lives and our world. It is an electronic revolution of 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 converting an 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 (television set), can then be electronically reconstituted into that
same image.
Television is more than just an electronic system, however. It is a means
of expression, as well as a vehicle for communication, and as such becomes a
powerful tool for reaching other human beings.
The field of television can be divided into two categories determined by
its means of transmission. First, there is broadcast television, which reaches
the masses through broad-based airwave transmission of television signals.
Second, there is nonbroadcast television, which provides for the needs of
individuals or specific interest groups through controlled transmission
techniques.
Traditionally, television has been a medium of the masses. We are most
familiar with broadcast television because it has been with us for about
thirty-seven years in a form similar to what exists today. During those years,
it has been controlled, for the most part, by the broadcast networks, ABC, NBC,
and CBS, who have been the major purveyors of news, information, and
entertainment. These giants of broadcasting have actually shaped not only
television but our perception of it as well. We have come to look upon the
picture tube as a source of entertainment, placing our role in this dynamic
medium as the passive viewer.
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