forest 作文what are the forest?what can forests provide us?why

Forst
As we all know,we can't live without oxygen(氧气),and the forest plays an important role in it.It's obvious that trees make up the forest and it can not only provide us oxygen but also keep us from being polluted.What's more ,the pencils we used also depend on it.
But a lot of people can't realise why the forest is important,and what they do is to cut trees as many as they can.Of course,the result is our enviourment is getting worse and worse.Well,it's time for us to do something to save forsets because of our beautiful life on earth.Only in this way can we live a comfortble life in the future.
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