To produce electricity on a large scale, a commercial wind farm will have to use bigger turbines than Hywind does, but it’s difficult enough to balance such a large turbine so high on a floating spar in the middle of the ocean. To make that turbine heavier, the whole spar’s to design a new kind of wind turbine, one whose gearbox(变速箱) sits at sea level rather than behind the blades (see picture )

　　Hywind is a test run, but the benefits for perfecting floating wind-farm technology could be extremely large. Out at sea, the wind is often stronger and steadier than close to shore, where all existing offshore windmills are planted. Deep-sea farms are invisible from land, which helps overcome the windmill-as-eyesore objection. If the technology catches on, it will open up vast areas of the planet’s surface to one of the best low-carbon power sources available.

　　(

　　) 1. The Hywind project uses totally new technology to ensure the stability of _______.

　　A. the cables which tie the spar to the ocean floor

　　B. the spar which is floating in deep-sea water

　　C. the blades driven by strong and steady sea wind

　　D. the stones filled in the spar below the sea surface

　　(

　　) 2. To balance a bigger turbine high on a flatting spar, a new type of turbine is to be designed with its gearbox sitting ____________.

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