The 1990s have brought on a revolution in the electronic media. This revolution is the result of the computer, telephone, fax(传真), and television. These technologies can be combined to bring many conveniences into the school, home, and office. People talk about "information super high-ways" that will soon offer services such as movies on demand, shopping without leaving your living room, picture phones, conversations with friends via(经由 ) computers, a push-button choice of 500 TV programs, bill payments from home, and access(进入) to databases (computerized selections of information) from around the world.