题目内容
Light for the City
Edison and his assistants came to New York to set up an electric power system. They hoped it would provide enough electricity to light up a part of the great city.
They bought several machines with them. These were called generators(发电机), which produced electricity power for lamps in Edison’s building.
Soon there were lights for the building. Edison lived in a room facing the street and he often worked over night. The light burned brightly and steadily and he often worked over night. People often came and stopped their horse-drawn carriage to look. Everyone knew that Thomas Edison was in town.
First, the inventor and his assistants produced several large generators. A great deal of power would be needed to light up even a small part of the city. Then the workers were busy digging deep trenches in the hard earth below the city streets, and Edison had fourteen miles of wire laid into the trenches. The wire connected each building to a generator.
Setting up an electric power system was not an easy job. It took a year and a half. In September, 1882, the job was finished.
A small group of men stood around Edison inside the power house. The big moment came at last. The inventor, taking a deep breath, pulled a switch. The electric lights flashed up.
“Very good! Very good!” a man nearby shouted to praise Edison for what he had done.
“Sir,” said Edison, “this is only the beginning!” And Edison was right. Soon Edison’s lamp were lighting up cities all over the world.
【小题1】The generators they brought with them could produce as much as electricity as ______ needed.
A.Edison’s building | B.a small part of the city |
C.the whole city | D.the world |
A.set up generators | B.lay wires | C.built city streets | D.build a power house |
A.set up the electric system |
B.produce several large generators |
C.dig the deep trenches |
D.lay fourteen miles of wire into the trench |
A.excited | B.frightened | C.uneasy | D.light-hearted |
【小题1】A
【小题2】B
【小题3】A
【小题4】A
解析
You can not see any object unless light from that object gets into your eyes. Some of the things you see give off light of their own. The sun, the stars, a lighted lamp are examples that can be seen by their own light. Such things are luminous. Most of the things you see are not giving off light of their own. They are simply reflecting light that falls on them from the sun or some other luminous bodies. The moon, for example, does not give off any light of its own. It is non-luminous. You see it because sunlight falls on it and some of it reflects in our direction. So moon light is only second hand sunlight.
When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.
Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380 000 kilometers away, in only a little more than a second.
1.You can see the book because_______.
A.your eyes are close to it |
B.it reflects some of the sunlight |
C.it has light of its own |
D.your eyesight can get to it |
2.The underlined word “luminous” means_______.
A.visible |
B.all colors |
C.giving off light |
D.sunlight |
3.________ have light of their own.
A.The sun and the moon |
B.The stars and the earth |
C.The sun and the stars |
D.The moon and the earth |
4.Which of the following is true?
A.All the things you can see give off light. |
B.Light from the book is much shorter than that from the moon. |
C.The moment you open your eyes the light from the book travels to your eyes. |
D.Light travels so fast that there is no time for you to read. |