【正确答案】 C

【答案解析】[解析] 考查语言学。A minimal pair(最小对比对)is two words that differ in only one sound. If more than two different words are identical in everyway except for one phoneme which occurs in the same place. they are called minimal set(最小音差的一组词).If a phoneme is substituted for another in a word and the substitution results in a change of the word meaning, the two phonemes are said to be distinctive phonemes(区分性音位).They are distinctive because each phoneme possesses its own distinctive features(区分性特征)．