这道题肯定不是C

howie0420

新prep上的一题，答案是C ,可是本人认为A跟好，请教各位大牛

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.

winnielxx

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

movingever

LS的分析太牛了。。。

Gracespa

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

yongjiew

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。

也就是说比较对象是power plants之间展开的，而不是Oil和Solar本身。A选项提到Oil而不是提到power plants，是典型的Shell Game选项。GMAC很喜欢出这样的迷惑选项。

B是无关选项；C提到了解决这个矛盾的一种可能，便是Oil power plants效能提高，另一种可能是Oil power plants的价格下降，也就是改写A为正确选项的办法；D和E都是无关选项。

但愿我的解释更清楚一些。