He is such a busy man that it’s hard for him to________ enough time to meet us at the airport.

A．offer

B．spare

C．prepare

D．order

女性，20岁，诉咀嚼无力，口腔检查发现上颌第一恒磨牙颊侧牙周袋约6mm深，牙齿松动Ⅱ度，口腔卫生尚佳，下前牙牙石Ⅰ度，拟诊

A．青春期牙周炎

B．慢性龈炎

C．单纯性牙周炎

D．复合性牙周炎

E．以上均不对