上消化道出血是指（）

A.贲门以上出血

B.幽门以上出血

C.Treitz韧带以上出血

D.空-回肠交界处以上出血

E.回盲部以上出血

       I toured Jiu Zhai Gou, I was deeply impressed with its beautiful scenery.

A．For the first time

B．At first

C．It was the first time

D．The first time