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?
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. 作者: winnielxx 时间: 2012-12-21 22:16
我认为答案就是C。
题干：Tech improvement of solar E increased cost-efficiency. But the
threshold of economic viability of solar power is unchanged at 35
bucks.
问题：哪个能说明为什么 incresed cost-efficiency of solar power
didn't decrease the threshold of economic viablity of solar power.
分析：先不看选项，分析原因有以下可能
1. solar E原料贵了，所以compensate了，Tech带来的技术提高
2. 其他形式Energy的Tech也提高了，所以solar E的threshold，还是那样。
看看选项，选C
A错在，混淆了概念cost of oil和efficiency of oil-fired power。油价可
以低不过不能保证efficiency高，因为可能管道维修贵了，石油工人工会工资
问题......，只是举2个例子。意思说cost of oil和efficiency of oil-
fired power的联系是主观的建立的，而不是题目已经给的。
B错在，支持反了
D错在，题干中没有涉及的无关选项
E错在，同B，同A作者: movingever 时间: 2012-12-22 06:51
LS的分析太牛了。。。作者: Gracespa 时间: 2012-12-23 07:30
其实就是solar技术进步了，我oil技术也进步了而已??不过A说实话一瞬间
我还真没看出问题，不过感觉C更紧贴题意罢了，看了2楼对于A的解释，我不
得不说我被2楼睡服了作者: yongjiew 时间: 2012-12-28 20:05
我来稍微补充一下2楼的解释。题目说的是10年前与10年后每桶石油价格都需要增加到35刀(to which the oil rise)，Solar power plants 才具备对 oil-fired power plants的竞争力。
