【正确答案】Television
   Television presents a vivid world in front of us. On television, we can watch exciting football matches or Olympic marathons. We can "travel" to New York to pay tribute to the Statue of Liberty or to London to attend the royal wedding. We can also "go" to a concert with a cup of coffee at hand. With a TV set, we can learn many things happening in the world without going outside our houses.
   Television can also play an educational role in our daily life. Besides regular courses for TV university students, television also offers various educational programs for different viewers. Children like "Tangram" ; young people like "the ABC of Computers"; and elderly people like "Life and Health". Of all the educational programs, "English on Sunday" is my favorite.
   However, television can also be harmful. It hurts our eyes and can cause nearsightedness. Watching too much TV influences our sleep and work and cuts down children's study time. Furthermore, some TV programs are not ideologically sound, so we should watch them selectively. In short, we should regard television as our slave, not our master.