74. In the past the country of Malvernia has relied heavily
on imported oil. Malvernia recently implemented a
program to convert heating systems from oil to
natural gas. Malvernia currently produces more natural
gas each year than it uses, and oil production in
Malvernian oil fi elds is increasing at a steady pace.
If these trends in fuel production and usage continue,
therefore, Malvernian reliance on foreign sources for
fuel is likely to decline soon.
Which of the following would it be most useful to
establish in evaluating the argument?
(A) When, if ever, will production of oil in Malvernia
outstrip production of natural gas?
(B) Is Malvernia among the countries that rely most
on imported oil?
(C) What proportion of Malvernia’s total energy
needs is met by hydroelectric, solar, and nuclear
power?
(D) Is the amount of oil used each year in Malvernia
for generating electricity and fuel for
transportation increasing?
(E) Have any existing oil-burning heating systems in
Malvernia already been converted to naturalgas-
burning heating systems
题目中说if the trends in fuel production and USAGE continue, therefore ,Malvernian reliance on foreign sources for fuel is likely to decline soon. 题目中已经考虑到了fuel的使用量并且暗含说明fuel usage会以一个比较平稳的趋势增长,因此我想问一下为什么答案和OG 的解释都给的是the country's need for oil was going to rise drastically to offset these trends.这样的话不就是和题目冲突吗?
或者说这题可以对他假设的条件进行evaluate,还是说usage在这里的意思当用方法讲而不是使用量讲。
逻辑一塌糊涂,还请各位帮帮忙......作者: triangel8866 时间: 2011-9-3 21:03
恩,不知道斑斑是什么思路,不过斗胆班门弄斧一下。
1. 逻辑链是--因为把取暖设备换成了用煤气的,所以对石油进口的依赖性
减少--evaluation的题可以当作weaken的题作。如果weaken的话,那么就会
说不仅仅是取暖设备对石油进口有依赖,还有别的东西对石油有依赖。以点盖面了。
2. 在作者的文章中有一个隐含的assumption,既usage=usage of heating
你可以这样想
Usage of heating system(a) + Usage of other system (b)= total usage
文章的结论是因为a减少,所以total减少。但是到底减不减少还要看b
我看manhattan里面,做所有逻辑题的3个准则中的一个就是要注意boundary words,就是用来划分边界的词。 像这个题,usage of heating system 就是指加热用的能源,不等于所有用的能源。有一个题比较典型,但我不知道题号了。--一种型号的车在its class 中产生的事故最少,所以这个车是最安全的。这个结论就是把its class 和所有的class混了。
有点像集合的题。要当心文章说的集合是子集还是所有的。
我说的文章中的结论,不是选项。
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