202. 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 not decrease substantially. (B) The population of Gortland has remained relatively constant during the country’s years of growing prosperity. (C) The per capita consumption of meat in Gortland is roughly the same across all income levels. (D) In Gortland, neither meat nor grain is subject to government price controls. (E) People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.

这道题OG答案选E。可是我觉得B也是对的，因为人均肉的消耗量增加了，如果总人口减少的话，肉的总消耗量是不变的，所以就不会产生以上的结果。所以这个结论也要建立在人口恒定的基础上。大家说呢？

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.

结论是，由于grain跟不上income的增长速度， 所以要进口。其实就是说，grain的消费是增长的， 但是如果象E所言，就如果消费减少，就不用进口了。

对于B，1）人口的多少与comsumption 的关系， 原文没有定义 2）问题的关键是抓住income increase.