公安工作所面临的形势和工作对象的复杂性，决定了公安工作具有复杂性。( )
参考答案：对
---I hear that Mary won the prize of the biology contest.
---______ She was not interested in it at all.
A．You’re kidding!
B．So what?
C．Why not?
D．Not really
高处作业的级别如何划分？
