患者女，9岁半，下颌发育差，唇略前突，能正常闭合，面下1／3高度偏小，鼻唇角正常，与其母面型相似。覆盖7mm，磨牙颊尖对颊尖关系，前牙Ⅲ度深覆，ANB5°，上前牙略前突有少量间隙，牙列无拥挤

本患者可能的病因是（）

A.遗传因素

B.不良习惯

C.营养不良

D.缺乏维生素

E.以上都不是

25.  ---You ought to have educated your son not to have eaten so much junk food, such as fried chicken, roasted mutton, smoked bacon and the like.

---I _______ .

A．did but he didn’t listen

B．ought to and he wouldn’t listen

C．ought to have; but he didn’t listen

D．should have but he hadn’t listened