—Why don’t you like winter in Beijing?

—Because it is        winter in Guangzhou.

A．as cold as

B．much colder than

C．not so cold as

D．not colder than

6个月男孩，发热、腹泻3天就诊。体温38．5～40℃（肛表），大便10～15次／天，为黄色稀水样，量中等。体检：患儿较烦躁，哭无泪，尿量很少。最合理的实验室检查是（）

A.尿常规+血常规+电解质测定

B.大便常规+尿常规+大便培养

C.大便常规+电解质测定+大便轮状病毒

D.大便常规+血常规+大便病毒分离

E.大便常规+电解质测定+血培养