. Clean water is ____ necessary than fresh air to the people living in big cities.

A．no more

B．no less

C．much as

D．not any more

下列哪项不是膜性肾病的特点（）

A.好发于中老年男性

B.易并发血栓栓塞

C.一小部分患者可自发缓解

D.血清C₃持续降低

E.早期经激素及细胞毒药物治疗多可缓解