曹操为统一北方曾与袁绍进行了一场战役，这就是[ ]
A．官渡之战
B．赤壁之战
C．淝水之战
D．长平之战
答案：A
I don't think it's good to copy other's homework.You should ________ it.[ ]
A.get over
B.get on
C.get up
D.get off
