Operations which left patients ______ and in need of long periods of discovery time now leave them feeling relaxed and comfortable.

A．exhausted

B．unhealthy

C．upset

D．fearful

烧伤休克的主要原因（）

A.患者烧伤时体液蒸发

B.大量红细胞丧失

C.大量体液从血管中渗出

D.疼痛

E.创面感染