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题库 / OG2017V-CR-184
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 not decrease substantially.
The population of Gortland has remained relatively constant during the country's years of growing prosperity.
The per capita consumption of meat in Gortland is roughly the same across all income levels.
In Gortland, neither meat nor grain is subject to government price controls.
People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.
B 两个错误
1.取非
之所以错误是因为作者假设的是人口没有大幅度减少，而非只是保持不变，因为大幅增加也是可以
因为对E取非，推出的结论与原结论相反（或：是原结论不成立）。这是assumption的标志！而如果B取非，会得到两种情况：人口增加，和 人口减少，无法推出与原结论完全一致的结果。
2.时间范围有出入。
The population of Gortland has remained relatively constant during the country's years of growing prosperity.文中用了has remained 和during the country's years of 描述的是截至现在为止的人口状况，不代表未来的人口会增加还是减少。而E用的是will...与题目要求预测未来相符。
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