选用所给句子完成对话。
A: Have you ever heard about a fund-raising event called Oxfam-trailwalker?
B: Yes. ____ 
A: Yes, it is. I am thinking of joining it. It’s a good chance to learn about working together.
B: ____ 
A: People over 18 years old. ____ 
B: It's a difficult walk but I’m really interested in it. Do you think I can join the walk?
A: ____  We can be in the same team.
B: Oh, ____ Let's find another two members.

下列溶液中，溶剂是酒精的是（  ）

如图三是肾单位结构模式图，请据图回答：

（1）血液从____ ____ 滤过到____ ____ 成为原尿．

（2）原尿经过____ ____ 的____ 作用，形成尿液．

（3）与3内液体相比，6内液体不含____ ．

（4）与原尿相比，尿中不含____ ，因为____ ．

（5）尿的形成包括____ 、____ 和____ 三个过程．

（6）图中流动脉血的结构序号是____ ．

（7）肾单位中血液由动脉血变静脉血是在____ ．