煤矿安全治理，要坚持（）。
A、依法办矿
B、依法管矿
C、依法纳税
D、依法治理安全
参考答案：A, B, D
They are _____ in Shenzhen now, I think they must enjoy themselves.[ ]
A. on holiday
B. on duty
C. on business
D. on watch
软件是程序、数据和 ______的集合。
