1. (2021·乐山) 听材料，回答下列各题。

1. （1） What are they talking about?

   A . How to go to school. B . How to save the environment. C . How to recycle waste paper.
3. （2） How many ways are the conversation mentioned?

   A . Two. B . Thee. C . Four.
5. （3） What's the last way?

   A . Saving money. B . Riding a bike. C . Using a bag instead of plastic bags.