今日京郊山川绿了，林木茂盛了，过去灌木丛生的山坡如今变成了茂密的森林，昔日光秃秃的山头也铺上绿色的植被，这样的巨变都是在改革开放这２０年中发生的。我国古代有辉煌灿烂的文明，然而古人对森林的破坏也是十分严重的。毁林开荒、无休止地砍伐森林已使其后代子孙深... Today, the suburbs of Beijing are green and lush forests. The shrubbery hill slopes are now densely populated forests. The former bare hills are covered in green vegetation. These changes took place during the 20 years of reform and opening up. In ancient China, there was a brilliant and splendid civilization. However, the destruction of forests by the ancients was also very serious. Deforestation, land reclamation, endless deforestation has made its future generations deep ...