To keep Chinese economy going on, the government has established an employment service system for _____ jobless urban residents, and for older laid-off and unemployed persons.

A．badly off

B．well off

C．cut off

D．paid off

脑组织的坏死属于（）。

A.干性坏疽

B.液化性坏死

C.凝固性坏死

D.湿性坏疽

E.气性坏疽