|
|||||
|
|
| 佳作 | |
| 摘 要： | Trees are very useful to people.They give us wood and other products. They give us shade, and they help to prevent drought and floods.But in many parts of our country people haven' t realized that.They cut them down at will.They are usually too lazy or too careless to |
| 本文献已被 CNKI 等数据库收录！ | |