根据内容，补全对话。   

A: 1_____ me, is 2_____ a post office near here?

B: 3_____. I don't know. Let's ask Mr. Wang. Mr. Wang, 4___ _ is the post office?

C: Oh, it's very far 5_____ here, but you can 6_____ a taxi.

A: Oh, no,1 want to go there on foot.

C: OK, let me tell you the way. Go down this street and 7_____ left, it's down Bridge

     Street 8____  the right. It's across 9           a big hotel.

A: 10_____. 

C: You are welcome.

同一组混凝土拌合物的取样应从同一盘混凝土或同一车混凝土中取样。取样量应多于试验所需量的（）倍，且宜不小于20L。

A.1.0

B.1.5

C.2.0

D.2.5