[CR. ] pp08 cr2-82
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.
C. Technological changes have increased the efficiency of oil-fired power
plants.
答案是C，請問A為何不對呢？
A和C在我看來都是差不多的。像C，就算效率提高，但油價仍然高漲的話，火力
發電還是很貴，太陽能電仍然有其效益。而A，則是油價提高，但不知道效率如
何。所以A和C似乎都不完整。
還是是我誤解了 "threshold of economic viability"的意思？
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