The little boy has ______ many bad habits after going to school.

A．broke away

B．got away from

C．kept away from

D．stayed away from

原始口腔的组成是（）。

A.额鼻突、上颌突、下颌突

B.额鼻突、侧鼻突、下颌突

C.中鼻突、侧鼻突、下颌突

D.额鼻突、球状突、下颌突

E.球上突、侧鼻突、下颌突