— How are the wounded (受伤的) pupils in the accident?

— Sorry. Two of them ______ though the doctors tried to save them. [ ]

A. disappeared

B. died

C. failed

关于对比剂的引入方法，错误的是（）

A.静脉肾孟造影--通过生理排泄法显影

B.消化道钡餐检查--通过直接引入法显影

C.静脉胆管造影--经静脉直接到达胆系显影

D.经皮穿刺肝胆系造影--直接引入法显影

E.口服胆囊造影--通过生理排泄法显影