明天考试，求一道CR的分析！

疯愁怂狗子

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 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.

文章括弧里的内容没看太懂，哪位童鞋可以帮忙解释下，答案是C

tinahuang95

周日也有考场？

jingnnee

http://forum.chasedream.com/GMAT_CR/thread-570378-1-1.html

风无衣

我那天做这道题也没怎么看懂。。。囧。。。
贴个NN的解释，希望对你有帮助~加油考试~

技术的进步，使得太阳能转换为电能变得更加的经济， 但是使用可行性准入门槛依旧是35元。问为什么提高了成本效率，为什么没有减低门槛。Ｃ选项说技术的进步也改变了ｏｉｌ－ｆｉｒｅｄ公司的效率。注意括号里面的解释，括号里面的大致的意思是说太阳能和石油成正相关，如果石油技术进步，那么太阳能转换技术也进步了，所以总体比率不变，所以门槛还是没降低

疯愁怂狗子

有啊。。我不就是活生生的例子么。。。

疯愁怂狗子

灰常感谢！！

疯愁怂狗子

thanks~