Beijing -- China on Tuesday questioned the appropriateness of an email sent by a Duke University medical school administrator warning Chinese students to speak in English. Asked about the controversy, foreign ministry spokesman Geng Shuang compared it to a Chinese university demanding that English-speaking students talk only in Chinese. "If a Chinese university required that American students not use English to communicate, I think this would not be normal," Geng said at a daily briefing. Duke University in North Carolina moved quickly to offer apologies, launch an investigation and reassure a core group of graduate scholars after the email raised...