gwd-6-4 是这么理解吗?

Q4:

In the past the country of Siduria has relied heavily on imported oil.  Siduria recently implemented a program to convert heating systems from oil to natural gas.  Siduria already produces more natural gas each year than it burns, and oil production in Sidurian oil fields is increasing at a steady pace.  If these trends in fuel production and usage continue, therefore, Sidurian reliance on foreign sources for fuel should decline soon.

Which of the following is an assumption on which the argument depends?

Deny A, we get "In Siduria the rate of fuel (i.e. oil) consumption is rising quickly than the rate of fuel production."  If so, and if the gap between oil consumption and domestic production can not be offset by the reduced demand of heating oil, S will still needs to import more foreign oil -- the original argument is weakened.  So, A is a necessary assumption.

你是对的

xiexie 我也明白了/

A：取飞，总消耗增长量快于总生产量，还是要进口

B：无关比较

C：取非，只有天然气可以用作石油的替代品，对原文没有影响

D：取非，太阳能可以用来供暖，out of scope

E：All不好，太绝对

NN们,这题我怎么上了鬼子的当呢?

原题中说"Siduria already produces more natural gas each year than it burns, and oil production in Sidurian oil fields is increasing at a steady pace.  If these trends in fuel production and usage continue",

如果天然气总是生产的比使用的多,那不就是说已经把A排除了吗?

我选了C,尽管有些勉强.

理由:题中结论是"Sidurian reliance on foreign sources for fuel should decline soon",但这个fuel 不一定等同于Gas或Oil. 感觉上像个逻辑上常见的概念变化.

假如C成立,那可能该国还计划用别的燃料代替石油,如果这种燃料也可能是进口来的,就不能得出结论了.

感觉GMAT逻辑思路总是不那么清晰.答案有时不是那么有说服力.如果这题没有"If these trends in fuel production and usage continue"这句话,我绝对会选A.

请NN指点一下.多谢!

你指出的原文是说gas,选项A是说fuel,没有关系啊,怎么能直接排除呢

有个问题

fuel应该包括oil和natural gas

这样理解对吗？

MM你搞错了，C没取非的意思就已经是“除了天然气没有其他的燃料可以被用来取代石油”