简述城市植被恢复的生态学原理。
参考答案:⑴以群落为基本单元的原则
⑵地带性原则
⑶生态演替原则
⑷以潜在植被理论为指导的原则
⑸多样性原则
⑹整体性和系统性原则
浙江自然资源贫乏,人均拥有量全国排名倒数第三位。
It was a bold idea to build a power station in the deep valley, but it______as well as we had hoped.
A.came off
B.went off
C.brought out
D.made out