The current prototype works at wind speeds ranging from 1.5 to 7 meters per second. The inventors say the next step is building a 12.5-meter tall bladeless generator with a 4-kilowatt capacity that could power small businesses or individual homes, or provide supplemental power to a main grid. The commercial version of the Vortex Bladeless generator should be ready for the market by 2017.

　　62.The author mentions a short film about the Tacoma Narrows Bridge to show ________.

　　A. what the initial philosophy or spirit was

　　B. what inspired Yanez to create the generator

　　C. how the bridge was destroyed in strong wind

　　D. how wind creates powerful vibrations

　　63.What do we know from the passage?

　　A. The original idea was considered as practical in an engineering firm.

　　B. Yanez and Martin’s initial tests by themselves proved to be successful.

　　C. The material for constructing the mast is different from that of the past.

　　D. The new generator is better at creating energy than a comparable bladed one.

　　64. What would be the best title for the passage?

　　A. Bladeless wind-power generator is friendly to birds.

　　B. Wind turbines are efficient sources of cheap energy.

　　C. A new generator will come onto the market by 2017.

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