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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.
题目逻辑关系：
某说法：因为土地资源有限而人口不断增加，所以粮食缺乏。
反驳：忽视了有家畜和人口抢粮。一斤肉对应消耗掉了21斤粮食。Conclusion--〉土地资源有限和人口增加不会使食物缺乏。
我觉得这样的推导足够成立conclustion，为什还要有一个assumption？即，通过取非，Ｅ怎么妨碍结论的推出了呢？？
不是很懂。
请教。 | 
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发表于 2005-3-17 21:59:00
