曹操大军南下，在赤壁与孙刘联军交战的目的是 [ ]
A．统一北方
B．统一南北
C．统治江东
D．统一黄河流域
答案：B
Sam has been appointed _______ manager of the engineering department to take ____ place of George.
A．/,/
B．the; the
C．the,/
D．/, the
