Most of the evidence was destroyed in the fire.________it would be almost impossible to prove him

guilty.[ ]

A. Even  

B. Still  

C. Thus  

D. Yet

6岁女孩，门诊就医，主诉为咳嗽、发热、右侧胸痛7天，胸片示右肺门阴影增宽，以下哪项检查不必要：（）

A.结核菌素试验

B.支原体抗体

C.血培养

D.冷凝集试验

E.白细胞总数及分类