上颌突与下颌突未联合或联合不全形成（）
A.单侧唇裂
B.斜面裂
C.横面裂
D.腭裂
E.颌裂
参考答案：C
The part that China _________in the international affairs _________ in the international society.
A．plays; is widely praised
B．takes; wide praised
C．takes; widely praised
D．plays; is wide praised
油脂采用酯交换改性一般是采用（）为催化剂。
A.甲醇
B.甲醇钠
C.乙醇
D.丙醇
