胞水肿时，主要发生病变的细胞器是（）。

A.线粒体和内质网

B.高尔基复合体和线粒体

C.核糖体和内质网

D.内质网和中心体

E.核糖体和中心体

— Do you know ________?

— It’s about fifteen minutes’ walk.

A．how far is the post office

B．which is the way to the post office

C．how long did you reach the post office

D．how far it is to the post office from here