Save the trees    

    Trees are our friends. They are very useful to humans. Firstly, trees  provide us with wood which can be made into paper ,rubber and pencils. And many trees provide us with fruits such as oranges, apples and peaches. Secondly, their roots can keep the rain, prevent droughts（干旱）and floods（洪水）,stop the soil from being washed away.Thirdly, trees can release oxygen, clean and cool the air.
    Unfortunately, nowadays in many parts of the world, lots of people can't realize the importance of trees. They cut down and burn millions of trees every year. Trees are in danger now.
    What can we do to save the trees? We must plant more trees every year and look after new trees carefully in order to keep the world green.