考博考试

【单选题】The graceful wooden windmills—a national symbol like wooden shoes and tulips—that have broken up the flatDutch landscape for centuries yielded long ago to ungainly metal-pole turbines.
Now, windmills are breaking into a new frontier. Though still in its teething stages, the "urban turbine" is a high-tech windmill designed to generate energy from the rooftops of busy cities. Lighter, quieter, and often more efficient than rural counterparts, they take advantage of the extreme turbulence and rapid shills in direction that characterize urban wind patterns.
Prototypes have been successfully tested in severalDutch cities, and the city government in the Hague has recently agreed to begin a large-scale deployment in 2003.Current models cost US$8, 000 to US$12, 000 and can generate between 3,000 and 7,000 kilowatt hours of electricity per year.A、typicalDutch household uses 3,500 kilowatt hours per year, while in the United States, this figure jumps to around 10, 000 kilowatt hours.
But so far, they are being designed more for public or commercial buildings than for private homes. The smallest of the current models weighs roughly 200 kilograms and can be installed on a roof in a few hours without using a crane.
Germany, Finland andDenmark have also been experimenting with the technology, but the ever-practicalDutch are natural pioneers in urban wind power mainly because of the lack of space. The Netherlands, with 16 million people crowded into a country twice the size of Slovenia, is the most densely populated inEurope.
Problems remain, however, such as public safety concerns, and so strict standards should be applied to any potential manufacturers. Vibrations are the main problem in skyscraper-high turbines. People don’t know what it would be like to work there, in an office next to one of the big turbines. It might be too hectiC、
Meanwhile, projects are under way to use minimills to generate power for lifeboats, streetlights, and portable generators. "I think the thing about wind power is that you can use it in a whole range of situations," saidCorin Millais, of theEuropean WindEnergyAssociation. "It’s a very local technology, and you can use it right in your backyarD、I don’t think anybody wants a nuclear power plant in their backyarD、\
The smallest model of an urban turbine ______.A．is designed for private homes.
B．weighs 2, 000 kilograms.
C．can be carried up to the rooftop without a crane.
D．can be installed with a crane.

网考网参考答案：C
网考网解析：
A是错误选项，第四段告诉我们目前这些涡轮机更多地不是为私宅而是为公共建筑和商业建筑而设计。B明显数字错误。D也是明显错误。只有C是正确选项。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>