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本贴相关题目 GMATPrep-2008E1-CR-82 (TUMZ)

00:00:00

Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade. However, 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) 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 threshold of economic viability?

AThe cost of oil has fallen dramatically.
BThe reduction in the cost of solar-power equipment has occurred despite increased raw material costs for that equipment.
CTechnological changes have increased the efficiency of oil-fired power plants.
DMost electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants.
EWhen the price of oil increases, reserves of oil not previously worth exploiting become economically viable.

正确答案: C

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楼主

发表于 2009-8-10 23:38:00 | 显示全部楼层

这道题确实关键在于对题目的理解。其实就是将单位太阳能以石油为基础进行经济性对比，比如一桶油价格为X能产生N千瓦的电力，那么要让太阳能比石油经济只要确认用太阳能产生N千瓦的电力所需要的成本低于X就可以了。

题目中提到的是随着技术提升成本X的太阳能能够产生N+M千瓦的电力，为什么对应的阈值没有变。这样理解就很简单，因为随着火力发电厂的进步X的石油也能产生N+M千瓦的电力。归根到底这里是一种相对比较而不是绝对的，两者进步一样快的话那么那个阈值就一直不会下来。

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