城市规划作为城市政府的一项职能，行 * * 力来源于不同方式的()

A.立法授权

B.行政体制

C.社会制度

D.国家机构组织

Oily rags stored in a pile that is open to the atmosphere are a hazard because they may（）.

A.deteriorate and give off noxious gasses

B.spontaneously heat and catch fire

C.attract lice and other vermin and serve as a breeding ground

D.None of the above