lsat-17-3-18

swimmingfrog

18.   In the United States proven oil reserves—the amount of oil considered extractable from known fields—are at the same level as they were ten years ago. Yet over this same period no new oil fields of any consequence have been discovered, and the annual consumption of domestically produced oil has increased.

Which one of the following, if true, best reconciles the discrepancy described above?

(A) Over the past decade the annual consumption of imported oil has increased more rapidly than that of domestic oil in the United States.

(B) Conservation measures have lowered the rate of growth of domestic oil consumption from what it was a decade ago.

(C) Oil exploration in the United States has slowed due to increased concern over the environmental impact of such exploration.

(D) The price of domestically produced oil has fallen substantially over the past decade.（E）

(E) Due to technological advances over the last decade, much oil previously considered unextractable is now considered extractable.

油产量跟十年前一样，但每年油消耗在增长。问解决矛盾

看完提干，我就自己猜，肯定是因为进口国外的油

所以就选了A，

E 好像再看也没什么道理啊技术进步，很多以前不能开采的，现在被认为能开采了。

可是美国就是知道能开采它也不去开采啊，它要保护自己的石油资源啊！

hedonism555

read carefully !

the annual consumption of domestically produced oil has increased.

[此贴子已经被作者于2004-12-23 0:02:14编辑过]

swimmingfrog

But I still don't know whyt E reconcile the discrepancy: Please pinpoint my understanding flaw.

1.the amount of oil considered extractable from known fields—are at the same level as they were ten years ago

2.no new oil fields of any consequence have been discovered,

annual consumption of domestically produced oil has increased

E Due to technological advances over the last decade, much oil previously considered unextractable is now considered extractable.   So what?

E 是不是直接削弱1，就是说

1.the amount of oil considered extractable from known fields—are NOT at the same level as they were ten years ago because they now know that much oil can be extracted

hedonism555

extractable = 提取 提炼  not exactly the same to exploit  

fact 1,  the available amount of extractable demestic oil is unchanged,

fact 2,  the consumption of it increased.

E  means the same amount of raw oil can be extracted much more refined oil due to technology advance.  so explain the discrepancy !

A  totally irrelevent

swimmingfrog

这次看我理解的对不（唉，好多次都把大侠们的解释理解错了，惭愧，惭愧）

可提取得原油的产量没变

消耗的精制油（精炼原油后的产物）确在增加

E： 技术进步，可以从不变的原油中提取更多的精制油，所以可以消耗增加。

thanks!

hedonism555

就好比是吃同样量的食物， 有的人胖， 有的人瘦， 因为吸收能力不同。

Bensontuo

swimmingfrog 发表于 2004-12-22 02:32
18.   In the United States proven oil reserves—the amount of oil considered extractable f ...

Spot the question type: Discrepancy

Core of the argument

1. The amount of oil extractable reserves are the same level as they were 10 years ago.

2. No new oil fields have been discovered

3. domestically consumption based on " domestically produced " has increased.

Why ?

1. There must be extra oil to be consume without counting as the oil reserves within 10 years.

2. They must not be any oil imported nor exported

Let us dive into the answers.

A. Annual consumptions are based on domestically production -> Wrong

B. No evidence

C. contradicts with the argument

D. It does not solve the discrepancy of " the amount of the oil reserves is the same within this 10 years "

E. we have more oil to be extractable from the original sites. ! Correct