民航总局对重要事项或者重大行动作出的安排，用（）公文处理。
A.决定
B.指示
C.通知
D.函
参考答案：A
I came across my old friend,Bob,this afternoon.He gave me a cold look though.It looked as if I________a stranger to him.[ ]
A. am
B. were
C. have been
D. would be
在"用九数，饮于白后之井"中，"白"之义为（）
A.白色
B.东方
C.西方
D.南方
