B
　　Although man has known asbestos for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent. H. W. Johns, owner of a New York City Supply Shop for roofers, was responsible for he opening of that first mine.
　　Mr. Johns was given a piece of asbestos which had been found in Italy. He experimented with the material and then showed its surprising powers to his customers. After putting on a pair of asbestos gloves, which looked much like ordinary work gloves, he took red-hot coals from the fireplace and played with them in his hands. How astonished the customers were to discover that he was not burned at all. You can well imagine that he had increasing business in asbestos roofing materials. However, because it was very expensive to transport them from Italy to the United States, Mr. Johns sent out a young scientist to seek a source nearer home. This young man found great vein in the province of Quebec in Canada.
　　Ever since 1881 Quebec has led the world in the production of this unusual mineral, which is made up of magnesium, silicon, iron, and oxygen. When it is mined, the asbestos is heavy, just as you would expect a mineral to be. When it is separated, a strange thing happens; the rock breaks down into fine, soft, soapy fibers .
　　Scientists do not know why the rock can be separated easily into threads,but they have found thousands of uses of this fireproof material, of the so-called “cloth of stone”.
　60. Which title best expresses the main idea of this passage?
　   A. Asbestos mined in Canada                  B. Fireproof matter
C. A “wonder” mineral                           D. A new roofing material
　61. Johns proved his ability as a salesman by_______.
　   A. going into roofing business              
B. carrying asbestos from Italy
　   C. sending a trained scientist                 
D. showing the use of asbestos gloves
　62. Which is the most important character of asbestos that the author wants to show us?
　   A. It is like thread.                               B. It feels soapy.
C. It burns easily.                                 D. It is unusually heavy.
　63. The author’s main purpose in writing this passage was to _______.
　   A. show the need for more scientists
　   B. compare asbestos with other minerals
　   C. increase the sales of asbestos
　   D. present facts about asbestos

They have brought us ____ such mineral dirt.

A. a big number of　　　 B a great deal

C. quantities of　　　　　 D. a plenty of

完形填空

　　Ecology(生态学) is a science of how living creatures and plants exist together and develop on each other and on the local government. Where an environment is undisturbed, the ecology of an area is 1 balance, but if a creature dies out or a new species(种类) is 2 then the ecology of an area will be upset, in other 3 , the balance. of nature will be 4 .

　　Man is a part of the 5 and has done more to upset the ecology during 6 short span of time on earth than 7 other creature . He has done this by his ignorance (无知) . his 8 , his thoughtless foolishness and his uncontrolled wastefulness. He has poisoned the 9 and polluted both land and water. He has wasted the earth's natural 10 , with no thought for the future, and has thought out the most devastating ways of killing his fellow men and every other sort of life at the same time.

　　Since man has done so much 11 , it is 12 to man to try to put matters 13 if it is not already too 14 . If there is to be any remedy(补救法) for our ills, that remedy ultimately lies in the hands of the 15 , and the sooner they start doing something about it, the 16 .

　　One of the main 17 of the earth's troubles is that the world is too crowded and that this overpopulation is growing at an ever-increasing rate. At the same time we are 18 up our natural resources — fuels and mineral ores — at an ever-increasing rate with no hope of replacing them.

　　For many years the earth has been unable to 19 enough food for these rapidly expanding population and the position has been steadily getting worse 20 some of our richest soils was lost and vast areas that were once fertile(富饶的) lands were turned into deserts.

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