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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 problem raised by the author in solid waste treatment and reuse is ______.
选项 A、economic and social
B、political and industrial
C、governmental and political
D、traditional and habitual
答案A
解析 本题为细节题。文章最后一段提出，若想真的在垃圾回收处理方面有所进步的话，还需要解决许多经济和社会问题，如再利用的材料能否与新材料相媲美?需要采取哪些措施来鼓励人们回收利用资源?居民们是否愿意支付这笔改造我们现有的垃圾处理系统的费用?
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