查处统计违法案件的程序包括______。
A．立案
B．调查
C．处理
D．处罚
E．结案
参考答案：A,B,C,E
待排序的关键码序列为(15，20，9，30，67，65，45，90)，要按关键码值递增的顺序排序，采取简单选择排序法，第一趟排序后关键码15被放到第( )个位置。
A．2
B．3
C．4
D．5
—Tom is never late for work. Why is he absent today?
—Something _____ to him.[ ]
A. must happen
B. should have happened
C. could have happened
D. must have happened
