General Motors Co., seeking to boost China sales 75% by 2015, apologized for a Chevrolet ad that included a song referring to "the land of Fu Manchu" where all of the girls sing "ching, ching, chop-suey," which one Chinese newspaper called racist. "Our intent was not to offend anyone and we're deeply sorry if anyone was offended," GM spokeswoman Ryndee Carney said in a telephone interview.