PREP08 CR02-82

ruirui_hsu

82.    (33511-!-item-!-188;#058&007598)

Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade.  However, the thresholdofeconomicviability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.
Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its thresholdofeconomicviability?
A. The cost of oil has fallen dramatically.
B. The reduction in the cost of solar-power equipment has occurred despite increased raw material costs for that equipment.
C. Technological changes have increased the efficiency of oil-fired power plants.
D. Most electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants.
E. When the price of oil increases, reserves of oil not previously worth exploiting become economically viable.

(that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants)
谁能把这个句子给我分析下。我这个句子是在是没看懂到底是啥意思。

sdcar2010

the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants)

This sentence in parentheses is a definition of the threshold of economic viability.  So the threshold is the price per barrel for oil which has to be reached when the new solar power plant can become more economical than the new oil-fired power plant.

ruirui_hsu

the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants)

These sentence in parentheses is a definition of the threshold of economic viability.  So the threshold is the price per barrel for oil which has to be reached when the new solar power plant can become more economical than the new oil-fired power plant.

-- by 会员 sdcar2010 (2011/6/26 20:15:57)

Ahhhh~~ cool guy!
That is, 为了使Solar Power Plant更加economical, 每桶油价需要上调。

另外，还有，关于这个threshold 的问题。threshold= solar efficiency- oil fire effiency? 这个理解起来有点困难。

ruirui_hsu

关于这个threshold我觉得还是没明白。虽然括号里解释了关于economic viability的定义。
看到一个解释说：是因为ratio of solar vs oil-fired plant 的比值不变，所以threshold也unchanged. 但是不懂。不知道原文是怎么推到的。

sdcar2010

Threshold is a benchmark. Above this benchmark, the new solar power plant is more economical than the new oil-fired power plant. At this mark, they are the same. Below it, the new oil-fired power plant is more economical.

ruirui_hsu

how did you get this? just from the original text?

sdcar2010

Here:
that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants

ruirui_hsu

Ok. Thats the point i cannot fully understand, so i miss the key information for solving this question.

Oh, god. CR is really difficult.... what and how can i do next!!

garlicwu

看了半天才搞明白这道题

题目的关键是对 threshold of economic iability 的定义，括号中意思是说要想太阳能电厂比油电厂效益高，每桶油的价格必须达到一个值，这也是为什么 threshold of economic liability用$35表示的原因，应该是指每桶油35块

举例说，太阳能电厂发100度电需要35块，油电厂发100度电需要一桶油，要想太阳能电厂效率高，每桶油价格就不能低于35块。这就是threshold，娘的，好晕呀

现在题目说太阳能电厂效率提高了，35块可以发120度电了，但是要想比油电厂效率高，每桶油还得35块，为什么？

油电厂说我效率也提高了，我现在一桶油可以发120度电了，靠，同样发120度电，你太阳能电厂凭什么比我效率高？所以太阳能电厂无赖了，妈的我要比你效率高，你每桶油就是不能低于35，这就是他娘的我的threshold

所以答案 C 出来了，我也晕死了

fanaf821

哈哈 谢谢楼上 非常形象生动 funny exlanation