______ the help of the teacher, the student who wasn’t good at math ______ the difficult problem quickly.

A．Under; worked out

B．With; worked on

C．Under; solved

D．With; solved

图片显示的是腹膜后肿物的镜下病变。其病理诊断应考虑为（）

A.皮肤纤维组织细胞瘤

B.黏液性恶性组织细胞瘤

C.结节性筋膜炎

D.隆突性皮肤纤维肉瘤

E.席纹状恶性纤维组织细胞瘤