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！
read carefully !
the annual consumption of domestically produced oil has increased.
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
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
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!
swimmingfrog 发表于 2004-12-22 02:32
18. In the United States proven oil reserves—the amount of oil considered extractable f ...
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