接车线末端设有避难线的车站如何接车？
参考答案：
不得不办理通过，接车线末端必须开通避难线，待列车停妥后，再按规定发车。
— Would you please repeat the grammar rules again?
— Of course, but I am sure that you _______ to me carefully, as I have told you twice already. [ ]
A. don't listen
B. wouldn't listen
C. weren't listening
D. aren't listening
资本市场线是（）。
A．连接无风险资产和最小方差组合两点的直线
B．连接无风险资产和有效边界上预期收益最高的风险资产组合的直线
C．通过无风险资产和风险资产组合有效边界相切的线
D．通过无风险资产的水平线
