When you talk about a person's _____, you are referring to the country, race, or social class of their parents or ancestors．

A．origin

B．nationality

C．generation

D．relative

胃镜检查的适应证是（）。

A.原因不明的上腹部疼痛、不适、饱胀、食欲下降

B.腹痛、腹泻或腹部包块

C.不明原因的便血

D.上消化道息肉摘除

E.上消化道出血原因不明