Understanding the cultural habits of another country, especially _____ containing many different subcultures like the USA, is a difficult thing. [ ]

A. which

B. that

C. one

D. those

大隐静脉汇入深静脉前的属支不包括（）

A.阴部外浅静脉

B.腹壁浅静脉

C.旋髂浅静脉

D.腹壁下静脉

E.股内侧浅静脉和股外侧浅静脉