—I heard that Mary won the prize of the ecology contest.

—______ She was not interested in it at all.[ ]

A. You're kidding!  

B. So what?  

C. Why not?  

D. Not really.

放射科工作人员遵守的原则（）

A.审查，决定是否进行下腹部检查，有权退回申请单

B.熟练掌握业务技术和放射防护知识

C.制备足够铅当量屏蔽物

D.X射线机符合国家规定

E.制定最佳检查方案