Hearing that I had won the first prize in the English competition, I felt a ________of excitement and

surprise.[      ]

A. mixture  

B. connection

C. increase    

D. sign

四肢CT检查采用双侧同时扫描的目的是（）

A.便于体位摆放

B.便于与健侧对照

C.使病人摆位较舒服

D.使增强扫描时注射方便

E.可最大限度利用有效扫描野