单选题 ______ is the smallest unit of language in regard to the relationship between sounding and meaning, a unit that cannot be divided into further smaller units without destroying or drastically altering the meaning.
【正确答案】 C
【答案解析】解析：考查语素。语素是最小的语言单位，不能再进一步分成更小的单位而不破坏或彻底改变词汇意义或语法意义。