Gortland has long been narrowly self-sufficient in both grain and meat.However, as per capita income in Gortland has risen, per capita consumption of meat has also risen. 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 no increase, Gortland will soon have to import grain. 9 V2 [( O6 i1 A, s 求assumption
B. The population of Gortland has remained relatively constant during the country's years of growing prosperity. E. People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain. 其他都是酱油选项
OA是E,NOT WEAKEN,我没问题。
但是想不通B为什么不可以选。GMAC给的理由是The argument is based on rising per capita income, not population levels. 但是,试想如果人均需求上升,而人口总数却下降了,总需求量也可能不变甚至下降,不是也会导致结论被weaken么?GMAT里per capita和总数的概念偷换也考过不少阿。求大牛指教,谢谢!