下列各项中，属于母病及子的是

A．肺病及肾

B．肝病及肾

C．肺病及心

D．心病及肝

E．脾病及肾

-- Excuse me, I want to buy some stamps. Where can I find a post office?

-- I know ______ not far from here. You can find ______ without difficulty.

A．that; it

B．it; one

C．one; it

D．it; that