(2013·安徽马鞍山两校模拟)—Which room would you prefer to live in, sir?

—________. As long as it is clean and comfortable.

A．I don't mind

B．I'm sure

C．No problem

D．Go ahead

7岁男孩，眼睑水肿4天，伴头痛、眼花，尿呈深茶色2天就诊。2周前曾患扁桃体炎，经用青霉素治疗好转。

首选的辅助检查是（）

A.B型超声检查

B.心电图

C.乙肝两对半测定

D.胸部x线

E.尿常规