The________on his face told me that he wasn't satisfied with my answer.[    ]

A. impression 

B. sight

C. appearance  

D. expression

胸膜摩擦音与心包摩擦音的鉴别要点为（）

A.有无心脏病史

B.患者体质状况

C.咳嗽后摩擦音是否消失

D.屏气时摩擦音是否消失

E.有无发热