OG 153 提问

153. 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. C

对于括弧里面的部分我看不明白, 搞不清意思, 看来还是阅读水平差, 请教该如何分析这个句子

题干：在过去的十年中，技术的改善和设备成本的降低使太阳能直接转化为电力更加划算，但是太阳能发电经济可行性的门槛依旧维持在35元（即：油价应该涨到这样一个价格，使新建的太阳能发电厂比新建的石油发电厂更加经济）（暗示目前一般用石油发电）

问：为什么太阳能发电的成本效益增加了却没有降低进入太阳能发电其经济可行性的门槛？

选C技术的变化提高了石油发电工厂的效率。(石油发电和太阳能发电的效率都有所提高，因此太阳能发电的门槛没变)

感谢,明白了

即：油价应该涨到这样一个价格，使新建的太阳能发电厂比新建的石油发电厂更加经济

这句话没看明白...

谢谢

同问,这个题没有看懂.

即：油价应该涨到这样一个价格，使新建的太阳能发电厂比新建的石油发电厂更加经济