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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. ANS:C
想請問 (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) 的確切意思是什麼?? 是指每桶油所增加的錢~會使solar power plants to be more economical than new oil-fired power plants ?? 感覺是這邊沒搞懂~~ 若能把整題的意思講解一下更好~~感謝~最后一句整一句是讲，当油价超过thirty-five dollars per barrel的时候，用solar power才会更划算。结合第一句， far more cost-efficient in converting solar energy 并没有导致solar power和oil-fired power之间的成本对比有明显的变化，显然，cost-efficient of oil-fired power也增加了。
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