Oil can be used in many ways and it’s difficult to imagine what the modem world will be like without oil. But oil isn’t easy to find and get out of the earth. Men must study the rocks. When they think the rocks in a certain place may have oil, a metal tower is built, a machine in the tower cuts a hole down into the ground. At the same time, a steel pipe（钢管）is pushed down to stop the .sides from falling in and to keep out water. At last if the men are right, usually the oil rushes up the sides with great force（力量）by the pressure（压力）of the gas in the top of the rock, and it rushes high into the air. If the oil catches a light, there will be a terrible fire,. So a kind of cover is fixed on the top of the pipe, and the oil can run out through taps（活塞）.

(1) The word“exploitation”in the passage means ________.

(3) Which of the following can be true according to（根据）the passage?

A．Coal gas can’t be used in houses and factories.

B．Oil is very important in the modem world.

C．Many governments encourage people to waste oil as much as possible.

(4) According to the passage, the right picture to show the tendency（趋势）to the amount of oil on the earth is.

A．The Exploitation of Oil

B．The Use of Oil

C．The price of Oil

Dogs like living with people. A dog can be a very good friend. He can do a lot of things for people. Some dogs help people to look after sheep, other dogs help them to find lost children. And some of the dogs can help the blind (盲人) do things.

Many years ago there was a very good dog. His name was Seeing Eye dog. Now we can see this kind of dogs all over the world. They are working for the blind.

The Seeing Eye dog is strong, good and easy to train(训练). He helps the blind to walk from place to place.

Before a dog becomes a Seeing Eye dog, he must go to a training school for about three months. First the dog has to learn to sit or stay when he hears the trainer’s call. In his next lesson the dog learns to make his trainer across busy streets.

The dog has many things to learn. And in every lesson he must learn to do one thing again and again for many times.

At the end of the training school he must take tests. When he passes the tests, the Seeing Eye dog will do the things by himself.

Now he can help blind people. The new master may be a man, a woman, or even a child. It takes the dog and his blind master about a month to learn to work and live together.

(    )46. We can see the Seeing Eye dog _______.

   A. only in the country        B. only in small cities

   C. all over the world         D. only on the busy street

(    )47. What can the Seeing Eye dog do?

   A. Look after sheep          B. Help blind people

   C. Find lost children         D. Train blind people

(    )48. If you want a dog to become a Seeing Eye dog, you must let him ________.

   A. go to a training school     B. go to a middle school

   C. go to an evening school    D. go to a children school

(    )49. First the dog has to learn to sit or stay __________.

   A. when he hears the telephone call       B. when he hears another dog’s call

   C. when he hears the master’s call        D. when he hears the trainer’s call

(    )50. How long will it take the dog and his blind master to learn to work and live together?

   A. one year    B. five years   C. about a month    D. one week