—Emma has been ill for a week. Is she all right now?

—__________. The teacher says she can come to school tomorrow. [ ]

A. I think so

B. That's it

C. I'm afraid not

D. That's true

6个月男孩，发热腹泻3天就诊。体温38～40℃，大便10～15次/日，为黄色稀水样便，量中等，有时呕吐。查体：患儿较烦躁，哭无泪，尿量很少。下面哪组检查最合理和急需（）

A.尿常规+血常规+电解质测定

B.大便常规+血气分析+电解质测定

C.大便常规+尿常规+大便培养

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