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题库 / Prep2007E1-CR-19
Gortland has long been narrowly self-sufficient in both grain and meat. However, as per capita income in Gortland has risen toward the world average, per capita consumption of meat has also risen toward the world average, and it takes several pounds of grain to produce one pound of meat. Therefore, since per capita income continues to rise, whereas domestic grain production will not increase, Gortland will soon have to import either grain or meat or both.
Which of the following is an assumption on which the argument depends?
The total acreage devoted to grain production in Gortland will soon decrease.
Importing either grain or meat will not result in a significantly higher percentage of Gortlanders' incomes being spent on food than is currently the case.
The per capita consumption of meat in Gortland is increasing at roughly the same rate across all income levels.
The per capita income of meat producers in Gortland is rising faster than the per capita income of grain producers.
People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.
原文提炼：Income增加，meat消耗增加，由grain生产meat。因为grain产量不增加，所以要进口。
A. 意味着grain产量减少，原文未提及。
B. 进口和人们在food上花费的关系，原文未提及。
C. Meat的消费和income增长“rate”的关系，原文未提及。
D. 依然是速率关系，未提及。
E. 如果grain的消费没有减少，那么就需要更多的grain进口来生产meat，成立。如果grain消费减少了，那么消费减少的部分可以用来进口meat，所以无需进口，原文结论不成立。
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