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Associated Press
Mayor R. Rex Parris of Lancaster, Calif., and Stella Li, president of BYD Motors, take a demonstration ride on an electric bus at the announcement of the opening of an electric bus manufacturing plant by the Chinese firm BYD, in the Southern California city of Lancaster Wednesday, May 1, 2013. BYD, known as Build Your Dream, is a major producer of batteries and electric vehicles in China. (AP Photo/Reed Saxon)

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