求助OG 12语文分册56 题！！

碎蓝晴空

Gortland  has long been narrowly self-sufficient in both grain and meat. However, as per capita 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 continue 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 year of growing properity.
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.































答案是E，虽然我能理解。。。但是我选的是A。。⊙﹏⊙b汗。。
NN们能给我解释下A 为神马不可以吗？A 的意思是说种植grain的地不会大量减少，为神马不能作为assumption呢？
大谢！！！！！

flystone

A说G这个地方grain的面积将很快下降，原文没说，原文只说产量了，没说种植面积问题