______ we are different from each other, we are good friends. [ ]

A. Although

B. Because

C. So

D. But

下列有关“硬化性骨髓炎”诊断要点，哪项不对（）

A.好发于股骨和胫骨

B.患骨皮质增厚、髓腔消失

C.患骨增粗，但无骨膜反应

D.一般无死骨形成

E.硬化区内常有大小不等的密度减低区