prep 08 33511-!-item-!-188;#058&007598

weihua89

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.

哪位大侠能中文翻译一下题干，没读明白什么意思

gwang5

技术发展以及设备价格下调使得将太阳能直接转化为电能的成本较上个世纪大为降低。但是太阳能经济可行性边界（即，每桶原油的价格要上涨多少才能使太阳能发电厂比使用燃油的电厂更加经济）并为改变，仍为35美元。

weihua89

我没太明白括号里的内容，为什么每桶油价格的上涨能使太阳能发电厂更经济？？