据史料记载，洪武十七年九月十四日到二十日，送到皇宫的奏章共1160件，涉及3291件事情，皇帝平均一天要处理411件事。导致这一现象的主要原因是(  )

A．改革行省制

B．设置军机处

C．废除宰相制

D．对外战争繁多

He can't seem to          a steady job; every two years or so he quits it, moves to another city

and starts again.[ ]

A. settle down

B. settle in

C. settle up

D. settle on