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?

A:The total acreage devoted to grain production in Gortland will soon decrease.

B: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.

C:The per capita consumption of meat in Gortland is increasing at roughly the same rate across all income levels.

D:The per capita income of meat producers in Gortland is rising faster than the per capita income of grain producers.

E:People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.

参考答案及共享解析

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正确答案： E:People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.

*题目类型：假设题

*题目场景： Gortland谷物和肉类长期勉强自足。然而，随着人均收入上升，人均肉的消费量也上升，并且要用好几磅谷物才能产生一磅肉。因此，由于人均收入上升，而国内谷物产量不会上升， Gortland不久将不得不进口谷物或肉类，或这两种

*题目推理：这个题逻辑链有两个变量，谷物和肉类，肉消费上升，产生肉需要的谷物也更多，所以总的需要的谷物也上升，所以需要进口谷物。显然这要在其他方面谷物消费不会减少的前提下

*选项分析："A G谷物生长的土地不久将下降；土地少不等于谷物产量少，无关，排

B 进口谷物和肉类不会导致比收入的更大比例花在食物上；食品占收入比例，无关，排

C 肉的人均消费与收入水平基本一致；无关，排

D 肉生产者的人均收入比谷物生产者的上升更快；无关比较，排

E 肉的消费上升不会导致谷物消费大量减少；假设题都是必要条件，取反如果结论不成立，说明假设正确；如果肉消费上升导致谷物消费下滑严重，那么生产的谷物就会足够生产需要的肉，所以不需要进口，取反削弱结论，正确"