对停留车辆须采取三道防线的线路是（）。
A、衔接正线的货物线、专用线
B、衔接到发线的货物线、专用线
C、货物线、专用线
参考答案：A
Since teaching is a job no one can be perfect at, it is necessary for teachers to keep improving their knowledge of the subjects they teach and their ______.
撞页
