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.

B 为什么不对。如果人口下降，总消费就下降，也不需要进口了。

望各位指教。谢谢。

文中指涉的是都是人均指数，所以单单一个总量不具决定性影响。比如，楼主你假设了如果人口下降，总消费就下降这种情况，此时我们并不能确定两者比值的结果即人均消费是上升、下降或是持平，所以无法判断是否应该进口。

谷总产量(不变)=肉 (↑)+谷 (?) 如果谷的需求↓, 那么可以平衡, G国仍可以self-sufficient, 结论就不对. 所以E完成了这个assumption, 因为谷的需求≥原来的需求 供不应求,所以必须要进口.

这道题可以取非做, not + weaken.

B个人认为population属于无关,可排除.