A.A locutionary B.An illocutionary C.A perlocutionary D.A speech
单项选择题The great source of modification of the air stream is found in the（）cavity.
A.nasal B.oral C.lung D.glottis
单项选择题Which of the following sounds is a voiceless bilabial stop?（）
A.[p] B.[b] C.[m] D.[t]
