请问一新PREP CR96题

pennybehappy

96.   (25050-!-item-!-188;#058&001167)    

Escalatingworldwide demand for corn is expected to cause the market price of corn to risesharply and remain high.  Although cornis extensively used as feed for livestock, livestock feed accounts for only asmall fraction of the retail price of meat. Therefore, the increase in corn prices is very unlikely to produce anycomparable long-term increase in the retail price of meat.
Whichof the following, if true, most seriously weakens the argument?
A.The cost of shipping and handling meat has also risen sharply.
B.Livestock producers who currently use corn to feed their livestock have theoption of switching to other kinds of feed.
C.The rising cost of feed is leading some livestock producers to leave thebusiness, thereby reducing the future supply of meat.
D.Worldwide demand for grains other than corn has also increased.
E.The price of corn affects the retail price of a variety of other food productsmore than it affects the price of meat.




答案是C我觉得没问题。但是为什么A不对？如果shipping费，处理费都增加了，那么最后肉的retail price也增加了不对吗？


谢谢解答

pennybehappy

再补充一下，当时做错后我自己想的原因是，这题是要求weaken argument，而A没有提到increase in corn prices，所以只能算是weaken到了结论，而没有weaken到argument，但是后来做到新PREP111题时：

111.    (28490-!-item-!-188;#058&002974)    (T-9-Q2)

Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to ensure that the nuts are sold to domestic processing plants.  If the tariff were lifted and unprocessed cashews were sold at world market prices, more farmers could profit by growing cashews.  However, since all the processing plants are in urban areas, removing the tariff would seriously hamper the government’s effort to reduce urban unemployment over the next five years.
Which of the following, if true, most seriously weakens the argument?
A. Some of the by-products of processing cashews are used for manufacturing paints and plastics.
B. Other countries in which cashews are processed subsidize their processing plants.
C. More people in Kernland are engaged in farming cashews than in processing them.
D. Buying unprocessed cashews at lower than world market prices enables cashew processors in Kernland to sell processed nuts at competitive prices.
E. A lack of profitable crops is driving an increasing number of small farmers in Kernland off their land and into the cities.

差不多的weaken题，而这题答案是E，E不就是他因削弱吗？

所以我不明白为何96题的A不对了。。。
不知道我的思路哪里出了问题

请教大家~~~

sdcar2010

96.   (25050-!-item-!-188;#058&001167)    

Escalatingworldwide demand for corn is expected to cause the market price of corn to risesharply and remain high.  Although cornis extensively used as feed for livestock, livestock feed accounts for only asmall fraction of the retail price of meat. Therefore, the increase in corn prices is very unlikely to produce anycomparable long-term increase in the retail price of meat.
Whichof the following, if true, most seriously weakens the argument?
A.The cost of shipping and handling meat has also risen sharply.
B.Livestock producers who currently use corn to feed their livestock have theoption of switching to other kinds of feed.
C.The rising cost of feed is leading some livestock producers to leave thebusiness, thereby reducing the future supply of meat.
D.Worldwide demand for grains other than corn has also increased.
E.The price of corn affects the retail price of a variety of other food productsmore than it affects the price of meat.




答案是C我觉得没问题。但是为什么A不对？如果shipping费，处理费都增加了，那么最后肉的retail price也增加了不对吗？


谢谢解答

-- by 会员 pennybehappy (2011/2/20 4:10:24)

But that rise in meat price is NOT caused by the rise in corn price. The conclusion of the arugment is that the rise in corn price will not have any effect in meat price. So A has no impact on this conclusion.

sdcar2010

再补充一下，当时做错后我自己想的原因是，这题是要求weaken argument，而A没有提到increase in corn prices，所以只能算是weaken到了结论，而没有weaken到argument，但是后来做到新PREP111题时：

111.    (28490-!-item-!-188;#058&002974)    (T-9-Q2)

Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to ensure that the nuts are sold to domestic processing plants.  If the tariff were lifted and unprocessed cashews were sold at world market prices, more farmers could profit by growing cashews.  However, since all the processing plants are in urban areas, removing the tariff would seriously hamper the government’s effort to reduce urban unemployment over the next five years.
Which of the following, if true, most seriously weakens the argument?
A. Some of the by-products of processing cashews are used for manufacturing paints and plastics.
B. Other countries in which cashews are processed subsidize their processing plants.
C. More people in Kernland are engaged in farming cashews than in processing them.
D. Buying unprocessed cashews at lower than world market prices enables cashew processors in Kernland to sell processed nuts at competitive prices.
E. A lack of profitable crops is driving an increasing number of small farmers in Kernland off their land and into the cities.

差不多的weaken题，而这题答案是E，E不就是他因削弱吗？

所以我不明白为何96题的A不对了。。。
不知道我的思路哪里出了问题

请教大家~~~

-- by 会员 pennybehappy (2011/2/20 4:14:39)

The arugment hinges on the assumption that once the tariff is lifted --> farmer will sell MORE of their products to international processing plants instead of domestic processing plants --> lay-offs in domestic processing plants --> higher unemployment rate in urban areas.

E) says if the government do not lift the tariff, more unemployed farmer will go to urban areas and pop up urban unemployement rate.

pennybehappy

谢谢楼上的回答
原来是我把第二题理解反了 第二题E选项的意思是 就算不取消tariff 很多失业的农民进城也会增加城市的失业人口

逻辑还真是需要仔细推敲。。。否则之前自己选对了就以为懂了 原来理解的根本不对。。。