谁能以Why are trees important为题写一篇八十字左右的英语文章

这是一个大联合、大统一的整体，是中国多民族统一的象征。 龙有浓烈的神话色彩，在封建社会里，又是帝皇"天威"与权力的象征。

As we all konwn that the world becomes hotter now,one of the reason is that desertification and degeneration of the grassland is increasingly serious.受字数限制,请参看下参考资料中的文章,...