Write a passage of at least 50 words on the topic “ Trees are important”. ( 以“树是重要的”为题写一篇不少于50个词的短文，标点符号不占格。)
Use the following points as a reference.（以下问题仅供参考）
Why trees are important?(Give at least three reasons)
What would happen without trees?
How can we protect trees?