[求助]OG12-28

philipyu1025

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 Gortlander's 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.
这道题为什么不选B呢？虽然我已经认同E的确是对的，但是我觉得B说的也有道理啊。如果引进肉跟grain之后肉跟grain的价格有了显著地增加，人们平均花在食物上的钱的比例就增加了，这样的显著地伙食费的增加非常有可能导致人们购买力的下降进而肉跟grain的需求也就不再如以前那么多，那么Gortland也许就不需要进口了呀！这个要细讲起来太复杂了，要建立的assumption太多了- -！
有没有兄弟姐妹帮我指点下迷津呀？谢谢了~

georgina1107

题干里说income增加，对meat的需求就增加，而并没有说明需求取决于meat的价格或者别的因素。。。所以楼主多虑了
我觉得food不像别的消费品，肚子吃不饱，只要有钱就算再贵也一定要买的，所以需求不会降低，而Gortland国内的产量又不够，所以还是要进口。。。

philipyu1025

谢谢这位仁兄的指点，豁然开朗！谢谢谢谢！

nymphl

有的时候手术也不是一次完成的吧，是不是新的手术方法有可能需要更多次的手术才能完成，而老方法是需要相对较少的几次手术就可以完成了，

或者说，last longer说的是使用寿命更长，但是也就是说比老方法能延续更久而不用全部重新更换，但是在使用寿命中难免出现需要维修、调试的情况，C考察的就是维修、调试的频率，而last longer说的是使用寿命，这两者不是一回事的。

楼主明白了吗