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?

当外界环境中气温高于皮肤温度时人体散热主要靠（）。

A.对流

B.蒸发

C.呼吸

D.传导

E.辐射