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[单项选择]Television, the modern wonder of electronics, brings the world into your own home in sight and sound. And the word "television" means seeing far.
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 hospital use TV for medical students to get close-up views of operations. At first television programs were broad- cast in black-and-white. With the development of science and technology, the problem of how to telecast them in full color was sol
A. be telecast in full color
B. be telecast in San Francisco
C. be telecast in Tokyo
D. be telecast in black-and-white
[单项选择]Television, or TV, the modern wonder of electronics, brings the world into your own home in sight and sound. The name television comes from the Greek word "tele", meaning "far", and the Latin word "videre", meaning "to see". Thus, television means "to see far". Sometimes television is referred to as video, from a Latin word meaning "I see". In Great Britain, the popular word for television is "telly".
Television works in much the same way as radio. In radio, sound is changed into electromagnetic waves which are sent through the air. In TV, both sound and sight are changed into electromagnetic waves. 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 30 years for TV to become an industry.
As an industry, TV provides jobs for hundreds of thousands who make TV sets and broadcasting equipment. It also provides work for actors, technicians,
A. people get on their clothes with programs printed on
B. people prepare and present the programs on TV
C. people like the programs
D. people acted in the TV programs
[单项选择]Television is said to be the modern wonder of electronics because （）
A. it influences people’s way of life
B. it makes people see far
C. it brings the world into people’s own home in sight and sound
D. it works as radio
[单项选择]Television,or TV the modem wonder of electronics,brings the world into your own home in sight and sound.The name television comes from the Greek word"tele".meaning "far"and the Latin word"videre",meaning"to see".Thus,television means"to see far".Sometimes television is referred to as video,from a Latin word meaning"I see".In Great Britain,thepopular word for television is"telly".
Television works in much the same way as radio.In radio,sound is changed into electromagnetic waves which are sent through the air.In TV,both sound and sight are changed into electromagnetic waves.Experiments leading to modem television took place more than ahundred years ago.By the 1920s,inventors and researchers had turned the early theories into working models.Yet it took another 30 years for TV to become an industry."…others who put on programs"means that______．
A．people get on their clothes with programs printed Oil
B．people prepare and present the programs on TV
C．people like the p
[单项选择]
The Television Camera
The television camera is rather like the human eye. Both the eye and the camera have a lens, and both produce a picture on a screen. In each case the picture is made up of millions of spots of light.
Let us see how the eye works. When we look at an object, a person, a house, or whatever it may be, we do not see all the details of the object in one piece. We imagine that we do, but this is not the case. In fact, the eye builds up the picture for us in our brain, which controls our sight, in millions of separate parts, and although we do not realize it, all these details are seen separately.
This is what happens when we look at something. Beams of light of different degrees of intensity, reflected from all parts of the object, strike the lens of the eye. The lens then gathers together the spots of light from these beams and focuses them on to a light-sensitive plate, the retina, at the back of the eyeba
A. The eye produces a picture on a screen.
B. We see all the details of an object in one piece.
C. Our sight is controlled by our brain.
D. The picture is made up of millions of spots of light.
