Water

 everybody knows water ,and we know water be inportant to us.

 first,we know the sea water is salty water,and fresh water comes from lakes, rivers and streams.In the world, Freshwater resources accounted for nearly three           persent,salty water accounted for ninety-seven percent of the world.

  Water is very important for us,in the world, everybody needs water ,plants need water   animals need water and people need water to.if no water,plants can't grow up and blossom  ,and they will die,then we can not  breathe the carbon dioxide.If no water,the animals will die,because they can't drank water.If no water ,the people can't drank the water and can't wash our bodies.