补全对话。

A: Did you go to the zoo last Sunday, Tony?

B：No，l                 ____．

A: Were there any sharks in the aquarium?

B:No,2                   .But there were some really smart seals.

A: That sounds interesting. Did you have a good time？

B: Yes, I enjoyed myself very much.  By the way, 3                 , Joe?

A:I went to the countryside to see my grandparents and my cousins.

B：4                      ？

A：It was very cool．

B：5                    ．

A: That's right .I played with my Cousins happily.

当柱作为建筑物的承重构件时，填充在柱间的墙仅起（）的作用。

A.承重

B.分隔空间

C.分隔空间及保证舒适环境

D.围护