---Look! Here comes the bus and I have to go now.

Thank you for coming to see me off.

--- Goodbye, _______.

A．congratulations

B．cheer up

C．all the best

D．go ahead

脊髓休克可见于（）

A.脊髓蛛网膜粘连

B.脊髓胶质瘤

C.脊髓空洞症

D.急性横贯性脊髓炎

E.脊髓后动脉血栓形成