Solar power is much more (56)than biofuel in terms of the area of land used. but it would still (57)150 square kilometres of photovoltaic(光电的)cells to match the energy production of the l000 MW nuclear plant. In another example, he says (58)the 2005 US electricity demand via wind power alone would need 780,000 square kilometres. an area the (59)of Texas.
However, several experts are highly critical of Ausubels (60). John Turner of the US governments 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.
51 A owned B left C held D bought
52 A fresh B costly C dirty D attractive
53 A scale B number C part D extent
54 A reduce B increase C produce D consume
55 A as B since C because D until
56 A effective B important C efficient D special
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