[单项选择]Generally there are ______ television programs for children on Saturday.
A. little
B. much
C. a large number of
D. a large amount of

[单项选择]If television programs did not feature criminals, they ______ result in increased violence in society.
A. would not
B. will not
C. did not
D. can not

[填空题]Programs of some large television networks will be produced in thousands of places.

[单项选择]
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. one way
B. two ways
C. three ways
D. a large number of ways

[单项选择]Radio and Television
Radio and television were major agents of social change in the 20th century. Radio was once the center for family entertainment and news and television enhanced this revolution by adding sight to sound. Both opened the windows to other lives, to remote areas of the world, and to history in the making. News coverage changed from early and late editions of newspapers to broadcast coverage from the scene. Play-by-play sports broadcasts and live concerts enhanced entertainment coverage. For many, the only cultural performances or sports events they would ever hear or see would come from the speakers or the screens in their living rooms. Each has engaged millions of people in the major historical events that have shaped the world.
If people could look at the sky and see how it is organized into frequency" bands used for different purposes, they would be amazed. Radio waves crisscross (十字形) the atmosphere at the speed of tight, delivering incredible
A. whether they can broadcast cultural performances
B. whether they may attract millions of people in the great historical events
C. whether they open the windows to remote areas of the world
D. whether they may offer sights to the people

[单项选择]
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, re-fleeted 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 eyeball. In this w
A. beams of light-lens of the television camera-an electronic device-electric impulses-aerials-receivers-pictures
B. beams of light-lens of the television camera-a plate-an electronic device-electric impulses-receivers-aerials-pictures
C. beams of light-a plate-an electronic device-aerials-electric impulses-receivers-pictures
D. beams of light-lens of the television camera-a plate-an electronic device-electric impulses-aerials-receivers-pictures