一道逻辑体

夏雨霏霏

14. 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?（C）
(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
我选A了，选C是因为他们都是因为技术进步而导致的么

donkid

个人认为选A有点无中生有，毕竟文中好像没提到意思，而技术进步是文中明确了的，所以感觉用这个解释更为妥当，毕竟是说“最能”解释现象的，认为C好一些。

deityc

A 是无关选项！
原文的意思是 随着技术的进步太阳能的效益越来越好，但是和以前一样的是，只有在油价是35美元以上的时候使用太阳能才是经济的。问：为什么

所以解释就是，烧油的机器的效率也提升了，在油价在35美元以下的时候用太阳能还是不赚钱。
本题问的是个使用标准，和 油价上升下降没关系