— The Queshi greenway has become a popular place for Shantou people on the weekends.

— That’s right. And you ________ drive your car on it because it is a path for cycling and walking. 

A．may

B．must

C．shouldn’t

D．don’t have to

四显示自动闭塞区段，出站信号机故障或停用时发出列车的行车凭证是（）。

A、调度命令

B、路票

C、绿色许可证

D、红色许可证