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58. Some people say that the scarcity of food is a function of the finite limits of the earth’s resources, coupled with a relentless rate of population growth. This analysis fails to recognize, however, that much of the world’s agricultural resources are used to feed livestock instead of people. In the United States, for example, almost one-half of the agricultural acreage is devoted to crops fed to livestock. A steer reduces twenty-one pounds of inexpensive grain to one pound of expensive meat. Thus, the scarcity of food is not merely a function of limited resources and population growth.
Which one of the following is an assumption that would allow the conclusion in the argument to be properly drawn?
(A) People prefer eating meat to eating grain.
(B) Meat is twenty-one times more expensive than grain.
(C) The limits of the earth’s agricultural resources are not finite.
(D) More than one-half of the agricultural acreage in the United States
is devoted to drops fed to humans.
(E) Growing crops for human consumption on the acreage currently devoted to crops for livestock will yield more food for more people.
这道题的结论是： 食物缺乏不仅是因为土地资源有限而人口数量不断增多还因为农产品中有相当大一部分是用来喂家畜， 可是答案E否定了农产品用来喂家畜导致食物缺乏，为什么E会是结论的assumption呢？ 这道assumption的题是用哪种方法解得呢?( 是概念差异还是将选项取非？）
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发表于 2010-3-23 19:32:04
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