根据句意和首字母完成句子。

1. Let's go up the m______, I want to get the top first.

2. They can run very f______.

3. These animals are our f______.

4. We shouldn't w______ too much water.

5. Please turn off the light w______  leave the room.

双代号网络图的基本符号不包括( )。

A．圆圈

B．箭线

C．节点

D．编号