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  3. The U.S. generates about four billion tons of solid waste a year. More than 90 percent is composed of agricultural and mining wa

The U.S. generates about four billion tons of solid waste a year. More than 90 percent is composed of agricultural and mining wa

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问题      The U.S. generates about four billion tons of solid waste a year. More than 90 percent is composed of agricultural and mining wastes. About 3 percent is from industrial wastes. 250 million tons of garbage and refuse come out from homes, schools, office buildings, stores and hospitals.
    This mass of metals, paper, food, plastic, rubber and glass which is all mixed together seems of no earthly use to anyone.
    Or is it? Scattered efforts across the country indicate that new technology, properly applied, might someday turn these millions of tons of refuse into an excellent source of raw materials for new uses.
    Several new projects are carried out to study the possibility of treating wastes through pyrolysis (高温分解)--a system of reducing refuse to basic chemicals, liquids and gases which have commercial value. In Florida, a special tube system provides automatic transport of refuse to a central collection building.
    In short, many new ideas are being tested, and many will be needed, since no one method is likely to prove suitable everywhere.
    However, many difficult economic and social questions must be answered before real progress can be made.  Can recovered materials compete with new materials? What will be needed as encouragement to make resource recovery work? Will citizens pay the costs of changing our waste system?
The article suggests that garbage and refuse from homes and public places ______.
选项 A、make up the largest percentage of solid wastes
B、make up a small percentage of solid wastes
C、are not really considered in the solid waste problem
D、are considered of no use to the earth
答案B
解析 本题为细节辨析题。文中提到，由农业和矿业制造的垃圾占垃圾总量的百分之九十，由工业产生的垃圾占百分之三，由此可见由家庭和学校、商店等公共设施产生的垃圾占到总垃圾量的百分之七，比例不大。
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