一 Good news! Bill won ______ medal in the long jump just now.

一 Really? That's his ______ one at our sports meeting. [ ]

A. a; four

B. an; fourth

C. a; fourth

尿酸性结石患者最宜选择下列何种食物（）。

A.动物内脏 

B.沙丁鱼 

C.凤尾鱼 

D.鸡蛋