单选题 The phoneme /n/ in the first word of all the following phrases changes to /m/ except ______.
  • A. clean bill
  • B. clean house
  • C. green wood
  • D. green pepper
【正确答案】 B
【答案解析】[解析] B项第二个单词音标以[h]开头,是声门音(glottal);其他第二个单词的音标都是以双唇音(bilabial)开头。