---Could you explain to me what an adventure is, Mr. Smith?

---An adventure doesn't necessarily mean doing something rough and dangerous. It may be _____ that you have never experienced before. [ ]

A. everything

B. something

C. anything

D. nothing

片状致密阴影，边缘模糊，其中心密度减低，形成透亮区，并有液平面。应考虑为（）

A.癌性空洞

B.结核性空洞

C.肺脓肿

D.肺囊肿

E.肺包虫囊肿