The Los Angeles district attorney on Monday charged Michael Jackson's personal physician, Conrad Murray, ______ involuntary manslaughter in connection with the pop icon's death in June.

A．of

B．for

C．with

D．as

革命的首要问题是（）

A、认清革命性质

B、认清革命对象

C、分清敌友

D、明确革命任务