read and think of other ways to prevent littering. 1.Encoura

read and think of other ways to prevent littering. 1.Encourage people to set an example for others
1.Encourage people to set an example for others,especially children.
2.Carry a litter bag in a car.
3.Cover open loads on all trucks.
4.
5.
4、5可以填什么啊、高手进啊、