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  3. America, unhappily, is bullish on garbage. Our production of refuse, now about 160 million tons a year, will rise to 193 million

America, unhappily, is bullish on garbage. Our production of refuse, now about 160 million tons a year, will rise to 193 million

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问题     America, unhappily, is bullish on garbage. Our production of refuse, now about 160 million tons a year, will rise to 193 million tons by the end of the century  【21】______ nothing is done. This growing effluence of affluence, 3.5 pounds a day for every American, is a  【22】______ of our consumer society,  【23】______ watchwords are "convenience", "ready to use" and "throw away". And it has become a major national environmental issue. forcing citizens,  【24】______ officials and private companies to  【25】______ serious thought to rubbish.
    The contentious reality is that the  【26】______ cheap and simple solution to trashdumping it in a landfill just beyond the edge of town  【27】______ no longer workable, particularly around major cities. Old dumps, which now get 8% of all garbage, are filling up, end new  【28】______ have become virtually  【29】______ to build with the result of skyrocketing land costs,  【30】______ stringent environmental regulations and shrill public opposition  【31】______ new landfills "in my backyard". "Five years from now,"  【32】______ Bruce Waddle. director of the Environmental Protection Agency’s municipal-solid-waste program, "we’ll have only half the number of landfills operating."
    With this grim prospect, new methods are required, all variations on the only four ways available to deal  【33】______ garbage: bury it, burn it, recycle it or don’t make as  【34】______ in the first place. What’s needed, experts say, is sophisticated  【35】______ fallout, called "integrated waste management" An  【36】______   valuable items are sorted out of the waste stream and turned  【37】______ new products, and the rest are burned cleanly in a furnace that also produces steam to  【38】______ electricity. Only the ash,  【39】______ of the original volume of trash, is then disposed  【40】______ in carefully engineered landfills.
选项 A、whatever
B、even if
C、whenever
D、if
答案D
解析 考查上下文理解．由句意与常识可知，空格后nothing is done(不行动，什么都不干)是空格前 rise to 193...(垃圾制造量到世纪末增长到……)的一种条件，因此选引出条件的if。注意even if 引出的是让步状语而不是条件。
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