—Did you make sense of what the man said just now?

—No, his meaning didn’t ______ ．Would you explain it to me?

A．get through

B．get off

C．get across

D．get out

在铁路的两条汇合线路线间距离为4米的中间，设置指示机车车辆的停留位置，防止机车车辆侧面冲撞的设备是（）。

A.进站信号机

B.通过信号机

C.出站信号机

D.警冲标