In the production of these sounds, the lower lip is
brought into contact with the upper teeth, thus creating the obstruction,is called ______.
A、dental
B、labiodental
C、alveolar
D、velar
【正确答案】：B
【题目解析】：labiodental:In the production of these sounds, the lower lip is brought into contact with the upper teeth, thus creating the obstruction.