—Are you going to take part in the speech competition?

—_____.It’s too good a chance to miss.[ ]

A. No problem

B. Thanks a lot

C. Never mind

D. That’s for sure

使用自动闭塞法行车时，遇出站信号机故障时发出列车，行车凭证为（）。

A、路票

B、绿色许可证

C、红色许可证

D、调度命令