加强对中央机构的控制是强化皇权的有效手段，为此，秦始皇采取的办法是  [ ]

A．太尉由丞相领导，御史大夫由皇帝直接领导

B．太尉和御史大夫由丞相统一领导

C．丞相、御史大夫、太尉三者互不统属，都对皇帝直接负责

D．御史大夫由丞相领导，太尉由皇帝直接领导

He had to take the medicine three times a day, so as to be  _____ pain in the leg.   [ ]

A. far from    

B. away from

C. apart from

D. free from