B

　　The sea is the largest unknown part of the world. It covers seventy-one percent of the earth. There is still much to be discovered about this vast blanket of water.

　　If the waters of the oceans could be moved away， the sea floor with its wide valleys， irregular mountains and rivers in the sea would be an unbelievable sight. Around the edges of the continents the ocean floor is flat and the water does not become much deeper for about thirty miles. Where there are high young mountains along the coast， this flat part may be much less than thirty miles. But where rivers flow into the sea， the flat area may extent for hundreds of miles.

　　The region near the continents， where the water is not so deep， is the place where the ocean‘s greatest riches in marine life are found. Below these creatures and plants are the largest known quantities of minerals.

　　At the end of the flat part the sea floor suddenly drops down， forming deep hollows which are shaped like bowls. These huge hollows hold most of the world‘s water.

　　Imagine， if you can， a mountain chain stretching 40，000 miles around the earth. It is hard to believe that this great under-water chain of mountain encircling the earth was discovered only a few years ago.

　　( )55. Land areas cover _______ of the earth.

　　A. seventy-one percent B. two-thirds

　　C. thirty-one percent D. twenty-nine percent

　　( )56. Around the edges of the continents the water is relatively ________.

　　A. narrow B. deep C. shallow D. regular

　　( )57. _______ is the good place for living creatures and plants.

　　A. The deep water area of the sea

　　B. The edges of the continent

　　C. The shallow water area not far from the continents

　　D. The area around the continents

　　( )58. A few years ago， ________ of 40，000 miles was ________.

　　A. a chain of mountains; found

　　B. a mountain chain; engirded

　　C. an under water chain of mountains; discovered

　　D. a mountain chain around the earth; imagined

　　C

　　Jenkins was a jeweler， a master craftsman for the Silkstone Jewellery Company. Ten years ago he made a large diamond ring for the company. It was worth $2，000. The second looked exactly like the first. Jenkins knew it would pass all the usual tests—except one perhaps. Jenkins gave the much more valuable ring to his wife， It was her fortieth birthday， and the couple flew to Paris for a weekend. Later， the company sold the ring for $6，000.

　　Six months ago the buyer brought it back to Silkstone‘s head office. “It’s a faulty diamond，” he said. “It isn‘t worth the high price I paid.”

　　He explained the ，facts. His wife‘s car had caught fire in an accident. She had escaped， but the ring had come off her finger. It had fallen to the floor and been damaged in the great heat of the burning petrol.

　　The company had to agree. They knew that no fire on earth can ever damage a perfect diamond. Someone had taken the real diamond and put a faulty stone in its place. The question was： who?

　　A picture of the ring appeared in the newspapers. A professional photographer thought he recognized the ring. The next day there was another picture in the paper： it showed a famous actress walking out to a plane for Paris. Behind the actress there was a woman wearing a large diamond ring. “Do you know the woman with the lovely diamond ring?” the papers asked their readers.

　　At his trial， Jenkins asked the judge to consider eighty-one similar crimes against the Silkstone Jewellery Company.

　　The judge said， “You are a master craftsman who turned bad. I feel rather sorry. But I must send you to prison. Seven years.”

　　( )59. Consider the name “master craftsman”。 From this story， do you think that a craftsman is clever in using his brain or his hands?

　　Which of these men might be master craftsman?

　　a. A shoemaker. b. A builder.

　　c. A secretary. d. A doctor.

　　e. A teacher. f. A watchmaker.

　　g. A toolmaker. h. A motorist.

　　A. a， b， f， g B. c， d， e C. a， b， f， g， h D. c， d， e， h

　　( )60. Who was important in the photograph?

　　A. The photographer. B. Jenkins.

　　C. The actress. D. The lady wearing the ring.

　　( )61. The company had to agree about ________.

　　A. the damage to the diamond B. the fault in the diamond

　　C. the price of the diamond ring D. the seven-year sentence

　　( )62. Who found Jenkins out?

　　A. The newspaper. B. A famous actress.

　　C. A professional photographer. D. The buyer.

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