口腔颌面部外伤出血最有效的止血方法是（）

A.填塞止血

B.结扎止血

C.指压止血

D.包扎止血

E.药物止血

A boy with two dogs_____ when the earthquake rocked the city.

A．were sleeping

B．is asleep

C．was sleeping

D．are asleep