Some things can carry(携带) messages, for example, a sign（标志） at the bus stop helps you to know which bus to take. Signs on the door tell you where to go in or out. Have you ever noticed that there are a lot of signs around you and that you receive messages from them all the time?
   People can communicate on many other ways. An artist can use his drawing to tell about beautiful mountains, about the blue sea and many other things. Books are written to tell you about all the wonderful things in the world and also about people and their ideas.
   Books, magazines（杂志）, TVs, radios（广播） and films all help us to communicate（交流） with others. They all help us to know what is going on in the world and what other people are thinking about.

—We’re going to have a soccer match with Class 2 this afternoon.

—_______.

________I can see，there is only one possible way to keep away from the danger.

下表反映我国人口分布的特点是（　　）

运动员完成挺举杠铃动作是由骨骼肌、骨和关节三者在神经系统的支配和其他系统的辅助下完成的．上述语言中的“其他系统”所指的一般不是（    ）