help.

redpot

Technology improvement and reduced equipment sosts have made converting solar energy directly into electricith 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 conomical than new iol-fired power plants) is unchanged at $35.

Which of the following best help explain why the increased cost-efficient of solar power has not decreased oil of economically viability.

A. The cost of oil has fallen dramatically.
B. The reduction in the cost of solar plant equipment has occurred.
C. Technology changes have increased the efficiency of iol-fired power plants.
D. Most power is generated by coal-fired or nuclear, rather than oil-fired plant.
E. when the price of il increased, reserves of oil not previously worth exploiting became economically viable.

The answer is C.

primefang

抓住原文的关键词，efficiency 和 price 的关系，此题就可解决

A oil 的cost  下降和efficiency 我们无法联系
B cost of equipment 和efficiency 也无法联系
C 讲到了efficiency ,说到了他因，因为虽然solar efficiency increase 但是oil 的efficiency also increase
D 用什么东西发电，和我无关
E 谈到reserve, 无关

redpot

Thank you very much.