题目

My dream ended when I was born. Although I never knew it then, I just held on to something that would never come to pass. Dreams really do exist. But in the morning when you wake up, they are remembered just as a dream. That is what happened to me. I always had the dream to dance like a beautiful ballerina(芭蕾舞女演员)turning around and around and hearing people applaud for me. When I was young, I would turn around and around in the fields of wildflowers that grew in my backyard.  Reality woke me up when I heard someone saying, I don't know why you bother trying to dance. Balleri一平行板电容器充电后与电源断开,负极板接地,在两极板间有一正电荷(电量很小)固定在P点,如图所示。以E表示两极板间的场强,U表示电容器的电压,ε表示正电荷在P点的电势能,若保持负极板不动,将正极板下移到图中虚线所示的位置,则    A.U变小,E不变        B.E变大,ε变大C.U变小,ε不变        D.U不变,ε不变
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