---This Math problem isn’t easy for Jack to work out, is it?

---_______. He is far better at Math problems than we expected.

A．No, it isn’t

B．I’m afraid not

C．Yes, it is

D．I don’t think so

男性，19岁，左侧鼻腔反复出血一年余，CT、MRI扫描如图所示，请选择最可能诊断()

A．鼻息肉

B．鼻咽腔脓肿

C．鼻咽部青年纤维血管瘤

D．鼻咽癌

E．鼻咽部淋巴瘤