2008职称英语题库理工类A级：完形填空

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　　第6部分：完形填空(第51～65题，每题l分，共15分)

　　下面的短文有l5处空白，请根据短文内容为每处空白确定1个最佳选项。

　　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 biofuels，would all require vast amounts of land if developed up to large scale productionunlike nuclear power. That land would be far better (51)alone，he says. Renewables 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 renewables. natural gas and nuclei(原子核)can (54)in terms of power per square metre of land used. Moreover, he claims that (55)renewable energy use increases. This measure of efficiency will decrease as the best land for wind. Biofuels, and solar power gets used up.

　　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

　　57 A show B require C collect D discover

　　58 A making B keeping C creating D meeting

　　59 A size B form C region D scope

　　60 A decisions B conclusions C solutions D modifications

　　61 A force B volume C power D control

　　62 A to B in C on D for

　　63 A take B give C set D turn

　　64 A adapts B applies C relates D appeals

　　65 A touches B faces C holds D covers