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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.
有几个前提是已经给出的，1对肉类的需求一定上升。2谷类的生产一定不変。——导致一定会进口谷类或者肉类。
A种植谷物的面积会很快下降，有点想否定前提的意思。错误。
B进口谷物和肉类将不会导致G国人均消费在食品上的部分上涨的比以前高。无关，超出逻辑链右边。
C肉类的人均消费水平和人均收入上升的比率相同。无关，无论上升比率是什么关系，肉不够用了是个事实。
D肉类生产者的人均收入超过谷物生产者的消费收入。无关
E,G国的人在增加他们肉类摄入量的同时不会减少它们谷物的摄入量。————正确，本来的谷物和肉类都刚刚好，现在人均收入上涨了，大家都想吃肉，如果都转去吃肉了而少吃了粮食，粮食就多出来了就可以用来生产肉，就不一定必须进口了。
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