求解PREP8的解释~谢谢CDer们！

jyw0411lsq

which of the following most logically completes the arguement?
Utraniawasformerly a major petroleum exporter, but in recent decades economic stagnation and restrictive regulation inhibited investment in new oil fields. In consequence, Utranian oil exports dropped steadily as old fields became depleted. Ultrania's currently improving economic situation, together with less restrictive regulations, will undoubtedly result in the rapid development of new fields. However, it would be premature to conclude that the rapid development of new fields will result in higher oil exports, because___
A. the price of oil is expected to remain relatively stable over the next several years
B. the improvement in the economic situation in Utrania is expected to result in a dramatic increase in the proportion of Utranian who own automobiles
C. most of the investment in new oil fields in Utrania is expected to come from foreign sources
D. new technology is available to recover oil from old oil fields formerly regarded as depleted
E. many of the new oil fields in Utrania are likely to be as productive as those that were developed during the period when Utraniawas a major oil exporter

这道题目答案是B,  我就是不理解C 和B ，谁来帮助我~谢谢！
尤其是C<，既然都需要依靠进口，那么短时间还能出口么，当然是出口不了的，所以说的是premature（题目说的啊）

sdcar2010

This is a math question. The logic of the argument is the following:
Premise: 1) Domestic petroleum industry will develop new field

Conclusion: The development of new field might not lead to higher oil exports.

You job is to find an enabling assumption to justify the conclusion.

B does that. If domestic consumption of oil increases more than the increase of oil production, the conclusion in the stimulus is valid.

C, on the other hand, is not an enabling cause, because its impact on oil consumption is unclear.

jyw0411lsq

你的意思是说：
C  因为不知道这个地方产生的油是否够自己用，如果不够，根本不可能出口，不确定因素太多、
B 正确答案的解释是： 因为以前经济不景气，现在经济好了，按理可以出口，但是现在经济好的结果伴随着该地区大量使用石油，结果暂时不够出口的。
我这个理解对吗？

sdcar2010

You are right!

lpbird

只能说相对正确，也不严密。凭什么汽车比例增长就是汽车数量增长？凭什么汽车数量增长就是汽油需求多，我用天然气不行？我用电不行？其实就是看你想的和出题人想的是不是一样的