D

　　Can animals be made to work for us? Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.

　　They point out that at a circus，for example，we may see elephants，monkeys，dogs and other animals doing quite skillful things. Perhaps you have seen them on television or in a film. If you watch closely, you may notice that the trainer always gives the animals a piece of candy or a piece of fruit as a reward. The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.

　　Of course，as we know，dogs can be used to guard a house，and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near. But it may be possible to train animals to work in factories. In Russia, for example，pigeons，which are birds with good eyesight，are being used to watch out for faults in small steel ball that are being made in one factory. When the pigeon sees a ball which looks different from others，it touches a steel plate with its beak. This turns on a light to warn people in the factory. At the same time a few seeds are given as a reward. It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 ,000 to 4,000 balls an hour.

　　Apes have been used in America in helping to make cars，and scientists believe that these large monkeys may one day gather crops and even drive trains.

　　102. What made scientists think animal can be made to work for us one day?

　　A. Animals are very skillful at a circus.

　　B. They are big and strong.

　　C. Some animals are as clever as human beings.

　　D. Animals can be trained because they like to get something as a reward.

　　103. The trainer usually gives the animals a piece of candy or fruit.

　　A. when it is hungry

　　B. before it plays a trick

　　C. when it starts to play a trick

　　D. after it has done the trick

　　104. Many animals may be trained to do simple jobs if they know .

　　A. who their trainers are

　　B. they will be praised by their trainers

　　C. they will get a reward

　　D. something dangerous will happen to them

　　105. Which of the following is NOT true?

　　A. Scientists consider apes may drive trains some day.

　　B. An ape is not a large monkey.

　　C. Apes have worked in some factories.

　　D. Apes may one day be used to gather crops.

　　E

　　In the old days，divers used to go down into the sea looking for ships that had sunk，because they hoped to find gold and jewels. Now divers still search for valuable things in sunken ships，but they also try to bring to the surface the ships themselves, or parts of them. The value of different kinds of metals has increased greatly over the last twenty or thirty years and even though a ship has been under the sea for many years，it may be worth a great deal.

　　One famous sunken ship is the “Lusitania” , which sank off the southern coast of Ireland in 1915 with a loss of nearly, 1,500 lives. It has four huge propellers made of an expensive metal. Today each of those propellers is worth $ 300,000 or more. The ship lying on the seabed has been brought by a man called John Light. He paid about $ 1,200,000 for the whole ship. He hopes to bring up those propellers and sell them. He also hopes to sell other parts of the ship, when he has brought them to the surface, for about $ 600,000.

　　106. Divers today try to bring to the surface .

　　A. gold and jewels B. parts of ships

　　C. whole ships D. all of the above

　　107. Divers try to bring up metals because .

　　A. they have been in the sea for a long time

　　B. some kinds of metals are worth a lot of money

　　C. it is easy to bring up metals

　　D. gold and jewels are not valuable things

　　108. The word “surface” in the passage means the .

　　A. market B. air

　　C. top of a liquid D. sea

　　109. John Light hopes that he may be able to sell all the parts of the “Lusitania” for about .

　　A. $12,000 B. $300,000

　　C. $1,200,000 D. $1,800,000