活组织穿刺为干酪样物质，为何病变（）
A.巨细胞瘤
B.单纯性骨囊肿
C.化脓性疾患
D.结核性病变
E.骨肉瘤
参考答案：D
_____________ is a fact that English is accepted as an international language.
A．There
B．This
C．That
D．It
方程（x-1）2=3的解为______．
