50岁女性，乳腺脂肪组织内切除一边界清楚、有薄层包膜的圆形肿块，直径3cm，镜下可见脂肪，组织内有少量乳腺组织，该患者病变应判断为（）

A.副乳腺

B.单纯性腺病

C.脂肪瘤

D.腺脂肪瘤

E.腺病瘤

The problem had become _____ in his mind, and he could not decide what to do about it.

A．simplified

B．exaggerated

C．matured

D．isolated