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  3. 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

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

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问题     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 the 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 is 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 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".
Johns proved his ability as a salesman by________.
选项 A、going into roofing business
B、carrying asbestos from Italy
C、sending a trained scientist
D、showing the use of asbestos gloves
答案D
解析 细节理解题。根据第二段第五句“You can well imagine that he had increasing business in asbestos roofing materials. ”可知，他从事的行业是石棉防火材料，所以A项表述错误；根据第二段第六句 “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. ”可知，把石棉从意大利运到美国很贵，所以约翰先生派一名年轻的科学家去附近寻找源头。所以B项、C项错误；根据第二段第二句“He experimented with the material and then showed is surprising powers to his customers. ”可知，他通过用石棉做实验，向他的客户展示出这种材料的神奇之处。故选D。
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