单选：无表情作用的表情肌为（）。A．口周围肌群rB．龈周围肌群C．鼻部肌群D．耳部肌群

请阅读Passage 1, 完成第小题。 Passage 1 In recent years,however, society has come ...

Which of the following practices can encourage students to read an article cr...

Which of the following exercises would a teacher most probably use if he/she ...

There is only one playground slide in this school, so the students have to ta...

在普通话中，下列（）声母不能和合口呼韵母相拼。A．双唇音B．唇齿音C．舌面音D．舌尖后音