如图所示，平行板电容器与恒压电源连接，电子以速度垂直于电场线方向射入并穿过平行板间的电场，若仅使电容器上极板上移，设电容器极板上所带电荷量Q，电子穿出平行板时的在垂直于板面方向偏移的距离，以下说法正确的是

A．Q减小，不变

B．Q减小，减小

C．Q增大，减小

D．Q增大，增大

Since the energy crisis, these big cars have become a real liability. They cost too much to run.()

A. lack of reliability

B. substitute

C. costly means of transport

D. disadvantage