—Do you know ________ man standing there?

—I only know he's from ________ European country. [ ]

A. a; an

B. the; the

C. the; a

D. a; the

男，11岁。2天前不慎碰伤右上臂，疼痛伴活动受限。X线片如图。应首先考虑的诊断是（）

A．骨囊肿

B．骨巨细胞瘤

C．成软骨细胞瘤

D．成骨细胞瘤

E．骨纤维异常增殖症