下列生态系统中，自动（自我）调节能力最强的是（　　）

可再生资源是指____的自然资源，非可再生资源是指____。

下列各项中不属于生物的是（  ）

    Mr. White lives in the countryside with his wife, Mrs. White. From Monday to Friday he works in a small office near his house. He is free on Saturdays and Sundays. He has a nice garden near his house. He likes growing flowers and he usually works in the garden on Saturdays and Sundays. The flowers are colourful and beautiful. Mrs. White likes them very much. She often helps Mr. White. They live happily together.

我国北方住宅区的楼房间隔，理论上应比南方更宽，理由是(　　)