问题描述： What good are trees?完成对话 1个回答 分类：英语 2014-10-31 问题解答： 我来补答 They are important to the planet.They can freash the air and prevent the earth from being taken away by water.They can also stop the wind from blowing the soil away.At the same time,they can be made into wooden furtinure. 展开全文阅读
