He always_________ newspapers after meals.

A．sees

B．reads

C．looks at

D．watches

冠周炎的病因是（）

A.因智齿萌出最晚

B.冠周龈瓣与牙冠之间的盲袋易堆积食物及细菌

C.颌骨长度不足

D.下颌智齿发育异常

E.邻牙牙周炎