有关化脓性关节炎与关节结核的鉴别，下列哪项无价值（）

A.是否有高热等急性全身表现

B.局部是否有红肿、疼痛、皮温明显增高

C.血和关节液的白细胞总数和中性粒细胞增多的程度

D.浮髌试验阳性

E.关节液是否培养出革兰阳性球菌

—Your father isn't a doctor, is he?

—_____. He teaches Chinese in a middle school. [ ]

A. No, he isn't

B. Yes, he is

C. Yes, he isn't

D. No, he is