What is the towering machine for?

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问题 What is the towering machine for?
  
The towering machines stand in a precise line across the seafloor, and they will be turned loose to capture the power of the wind. And then, after weeks of testing and fine-tuning, America’s first offshore wind farm will begin pumping power into the New England electric grid.
   The idea of building turbines offshore, where strong, steady wind could, in theory, generate large amounts of power, has long been seen as a vital step toward a future based on renewable energy. Yet even as European nations installed thousands of the machines, American proposals ran into roadblocks, including high costs, murky rules about the use of the seafloor, and stiff opposition from people who did not want their ocean views marred by machinery.
   Now, offshore wind may be on the verge of rapid growth in the United States. Using a law passed by a Republican-led Congress in 2005 and signed by President George W. Bush, the Obama administration has been clarifying the ground rules and leasing out large patches of the ocean floor for wind-power development. Nearly two dozen projects are on the drawing board, with some potentially including scores of turbines. Equally important, state governments in recent months have been making big, new commitments to renewable power, driven by a rising sense of urgency about climate change.

选项 A、It is a renewable energy.
B、It can reduce the air pollution greatly.
C、It has been operated for a long time.
D、It can generate a large amount of electricity.

答案D

解析 从文中“generate large amounts of power,has long been seen as a vital step toward a future based on renewable energy.”可以知道,风力农场可以利用可再生资源风力来大量地发电。选项B和C在文中并没有提及。选项A描述的是风力,而不是风力农场这个项目。
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