Or are you afraid that your friend would laugh at you, or would not understand what you are ________?

A．looking through

B．looking at

C．going on

D．going through

患者，男，双侧下颌第三磨牙反复肿痛求拔除。拔牙后第2天，患者因拔牙创出血求治。

其出血可能原因为（）.

A.牙龈撕裂

B.颌骨中央性血管畸形

C.系统性出血性疾病

D.局部小血管破裂

E.感染致局部出血