Nowaways,many rivers are pollutee.many factories have been built near river.And they pull dirty water into rivers.Then day by day,rivers become dirtier and dirtier.But twenty years ago, they are clean.The governmeng must make some bans to protect the river.Then the earth will be more beautiful.
I love the clean river very much,but there is someing about pollutionin the river. for exemple :The person always put the livegarbage in the rive and sometimes they full the factry garbage to the rive .Thought they fell it is very handly ,they don't know that pullut the river too! So every body must supervise that pollution.