标题: old prep p1 19望指教~~ [打印本页] 作者: moumouliu 时间: 2011-5-5 21:35 标题: old prep p1 19望指教~~ 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 soon decrease. (B) Importing either grain or meat will not result in a significantly higher percentage of Gortlanders' incomes being spent on food than is currently the case. (C) The per capita consumption of meat in Gortland is increasing at roughly the same rate across all income levels. (D) The per capita income of meat producers in Gortland is rising faster than the per capita income of grain producers. (E) People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain. 不知道为什么选择E啊！望指教~~作者: clumsy123 时间: 2011-5-5 21:45
the conclusion said that since per capita income will rise but grain production will not increase, G will soon have to import either grain or meat or both. I think there is a underlying assumptions: the author believes that the consumption of the meat and grain will increase. SO, the E exclude a possibility that the total consumption would decrease.
if you negate E, people in Gortland who increase their consumption of meat will radically decrease their consumption of grain. The total consumption of meat and grain could not change, or even decrease, and then the conclusion can not be drawn.作者: fuknokia 时间: 2011-5-6 15:41
这个可以使用排除法。