Television, the modern wonder of electronics, brings the world into your own home in sig

Television works in much the same way as radio.In radio, sound is changed into electromagnetic waves which are sent through the air.Experiments leading to modern television took place more than a hundred years ago.By the 1920s inventors and researchers had turned the early theories into working models.Yet it took another thirty years for TV to become industry.

The influence of TV on the life of the people is incalculable: it can influence their thoughts and their way of life.It can also add to their store of knowledge.Educational TV stations offer teaching in various subjects.Some hospitals use TV for medical students to get close-up views of operations.At first television programs were broadcast in black-and-white.With the development of science and technology, the problem of how to telecast them in full color was solved and by the middle 1960s the national networks were broadcasting most of their programs in color.

The programs that people watch are not only local and national ones.Since the launching of the first communications satellite, more and more programs are telecast ‘live’ from all over the world.People in San Francisco were able to watch the 1964 Olympic Games in Tokyo.And live telecasts now come form. outer space.In 1969, the first astronauts to land on the moon televised their historic ‘moon walk’ to viewers on the earth.Since then, astronauts have regularly sent telecast to the earth.

1.The launching of communications satellites make it possible for people in San Francisco to ________.

A.get close-up views of operations

B.watch the 1964 Olympic Games in Tokyo

C.store knowledge

D.watch national programs

2.The development of science and technology made it possible for television programs to ______.

A.be telecast in San Francisco B.be telecast in full color

C.be telecast in Tokyo D.be telecast in black-and-white

3.The word ‘incalculable’ means _____.

A.easy to tell

B.difficult to tell

C.very great

D.very small

4.Television is said to be the modern wonder of electronics, because_____.

A.it influences people’s way of life

B.it brings the world into people’s own home in sight and sound

C.it works as radio

D.it makes people see far

5.Television became an industry in ______.

A.1950

B.the 1950s

C.the 1920s

D.the 1960s