女性25岁。风湿性心脏病主动脉瓣狭窄，近3周来乏力不适就诊。体检：皮肤有少量瘀点，主动脉瓣区有收缩期和舒张期杂音，脾可触及。血红蛋白80g/L。

下列哪项实验检查最有助于明确诊断（）

A.血沉

B.血细胞分类

C.血培养

D.C反应蛋白

E.抗O

To our surprise,  the man looking very rude____ his son very carefully.

A．take care

B．look after

C．attended

D．All of the above