Finding her car stolen, _____. [ ]

A. a policeman was asked to help

B. the area was searched thoroughly

C. it was looked for everywhere

D. she hurried to a policeman for help

指出属于软骨类的肿瘤是

A． 骨瘤

B．外生骨疣

C．骨巨细胞瘤

D．非骨化性纤维瘤

E．骨肉瘤