标题: 完全不懂的一题！牛牛们！ [打印本页] 作者: Xiaotongdi 时间: 2011-10-16 13:48 标题: 完全不懂的一题！牛牛们！ 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.
答案是C！什么意思呢？ 作者: 九段泡面高手 时间: 2011-10-16 20:00
C 不是明明白白么??太阳能转化设备的效率提高了，我烧汽油的设备的效率一样提高了，你省钱了我更省钱了。所以我们不用太阳能，继续烧油??