是一篇半命题作文 Save _____ 讲述一些背景 原因

I often use paper to do my homework.And I use paper to make model plane as well.Paper is made from trees.We cut down and burn millions of trees every year.But we replace hardly any of them.Trees are in great danger.We can save trees by saving paper.we can get in the habit of saving paper by reusing paper.