Though he was born and brought up in America, he can speak _______Chinese.
【正确答案】 B
【答案解析】解析:译文为:虽然他在美国出生和长大,但他能够说一门口流利的汉语。smooth平稳的,光滑的;fluent流利的;fluid液体的;flowing流动的,平滑的。