________you've got a precious chance, you might as well make full use of it. [ ]

A. In case  

B. Now that

C. Even though  

D. The moment

尽头线的有效长，对向道岔（无轨道电路）时为（）的距离。

A.尖轨尖端至车挡

B.警冲标至车挡前10m处

C.警冲标至车挡

D.尖轨尖端至车挡10m处