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  3. The graceful wooden windmills—a national symbol like wooden shoes and tulips—that have broken up the flat Dutch landscape for ce

The graceful wooden windmills—a national symbol like wooden shoes and tulips—that have broken up the flat Dutch landscape for ce

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问题     The graceful wooden windmills—a national symbol like wooden shoes and tulips—that have broken up the flat Dutch 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 several Dutch 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 typical Dutch 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 and Denmark have also been experimenting with the technology, but the ever-practical Dutch 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 in Europe.
    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," said Corin Millais, of the European Wind Energy Association. "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."  
Netherlands leads in urban turbine technology because ______.
选项 A、the Dutch are natural pioneers.
B、the Dutch have a tradition with windmills.
C、Netherlands is windier than Germany, Finland and Slovenia.
D、Netherlands is a small country with a large population.
答案D
解析 第五段的第一句告诉我们，由于土地有限，荷兰人在城市风力发电技术方面是当然的先锋，第二句说，荷兰是欧洲人口最为密集的国家。因此，D是正确选项。
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