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153. 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.
这道题我对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)理解得不是很清楚，请大家指点，正确答案是第3个
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