Football, ________ is an interesting game, is played all over the world.

A．that

B．which

C．it

D．who

老年女性，54岁，既往无腰部疼痛史，无血尿史，超声检查发现右肾上极实质内可探及稍增强回声，边界清楚，直径12mm，CD-FI：稍增强回声内部未见明显血流信号，2个月后复查，稍增强回声未见增大。诊断可能为（）。

A.肾错构瘤

B.海绵肾

C.肾上腺瘤

D.肾柱肥大

E.Wilms瘤