关于水资源的ppt

tear!
Thanks for listening
Seine
suzhou river
Who is the devil?
The water is just like the blood in the active body.
Not to waste a single drop of water, otherwise, the only drop of water we could keep in the future would be our
Cherish the water resource
How much water are there on the ewk.baidu.comrth?
There is only a spoon of the water resource on the land，and the water we can use is only a drop of it.