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.
according to the passage, to decreased solar plant's threshold of economic viability, we should reduce the GAP of cost effeciency between solar plant and oil plant...
a only tells us that the cost of oil has fallen, but without other information, we can't safely conclude that the efficiency of oil plant has been reduce and therefore explain the problem...
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发表于 2003-8-20 13:07:00
