题目内容：
根据以下材料，回答题Debate over the Use of Renewable Energy
Ausubel of Rockefeller University in New York, US says the key renewable (可再生的) energy sources, including sun, wind and bio-fuels, would all require vast amounts of land if developed up to large scale production--unlike nuclear power. That land would be far better ___________ (51) alone,he says. Renewable look ___________ (52) when they are quite small. But if we start producing renewable energy on a large ___________ (53), the fallout (结果) is going to be horrible.
Ausubel draws his conclusions by analyzing the amount of energy that renewable, natural gas and nuclei (原子核) can ___________ (54) in terms of power per square meter of land used.
Moreover, he claims that ___________ (55) renewable energy use increases, this measure of efficiency will decrease as the best land for wind, bio-fuels, and solar power gets used up.
Solar power is much more ___________ (56) than bio-fuel in terms of the area of land used,but it would still ___________ (57) 150 square kilometers ofphotovoltaic (光电的 ) cells to match the energy production of the 1,000 MW nuclear plant. In another example, he s'ays___________ (58) the 2005 US electricity demand via wind power alone would need 780,000 square kilometers,an area the ___________ (59) of Texas.
However, several experts are highly critical of Ausubel's ___________ (60). John Turner of the US government's National Renewable Energy Laboratory says that even if the US got all of its ___________ (61) from solar energy, it would still need less than half the amount of land that has been paved over ___________ (62) highways, Further, it need not ___________ (63) up additional land. The US could get a quarter of its energy just from covering rooftops of existing buildings, he says.
According to Turner, the same "dual use" also ___________ (64) to wind power. "The footprint for wind is only 5% of the land that it ___________ (65). Farmers can still farm the land that the turbines are on." Turner says looking solely at land use is an oversimplification of the issue.
回答(51)题 A．owned
B．left
C．held
D．bought
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