Televisiozn —— that most widespread and persuasive of modern technologies, marked by rapid change and growth —— is moving into a new era, an era of extraordinary advancement and diversity, which promises to reshape our lives and our world. It is an electronic revolution, made possible by the marriage of television and computer technologies.
The word ‘television’, coming from its Greek ( tele: distant) and Latin ( vision: sight) roots, can literally be interpreted as sight from a distance. Very simply put, it works in this way: through an advanced system of electronics, television provides the capability of changing 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 reorganized into that same image.
Television is more than just an electronics system, however. It is a means of expression, as well as a tool 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(播送，中转). First, there is broadcast television, which reaches the masses through 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 that 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 providers of news, information, and entertainment. These giants of broadcasting have actually shaped not only television but our understanding 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.
What seems to be the best title for the passage?

A．A Powerful Tool of Entertainment.	B．The Means of Transmission of TV.
C．TV: Its Working Rules and Functions.	D．A Brief Introduction to the Development of TV.

The rapid change and growth of TV is due to the contributions of      ____ .

A．computer technologies	B．a new means of transmission
C．a powerful vehicle of communication	D．TV giants like ABC, NBC and CBS

The use of the second means of transmission is to meet the requirements of        ____.

A．the people especially interested in nonbroadcast program.

B．certain groups of people.

C．the people with a special interest in cable TV.

D．the people interested in controlled transmission techniques.

The underlined “very simply put” in Paragraph 2 means       ____.  

A．when it is simply put down	B．when it is put to simple tasks
C．if it is put to simple uses	D．if it is expressed in a simply way