题目

Doctor Johnson, I don't want to eat now, that's because nothing has a taste for me. It's been like this for long. In fact, I didn't have a delicious meal after I caught a terrible cold last month, What can I do?Here are some medicine, Mrs. Harris. Take three pills three times a day for seven days and come back and see me. But remember, don't eat anything during the week, or you can just drink some water.Next week an upset Mrs. Harris came into Dr. Johnson's office. Doctor! I'm doing it just as you told me, but delicious food is still tasteless for me. I don't know what was in those pills, but 如图所示,一电场的电场线分布关于y轴(沿竖直方向)对称,O、M、N是y轴上的三个点,且OM=MN.P点在y轴右侧,MP⊥ON.则下列说法错误的是(  )A.M、N两点间的电势差小于O、M两点间的电势差B.M点的电势比P点的电势高C.将负电荷由O点移动到P点,电场力做正功D.在O点静止释放一带正电粒子.该粒子将沿y轴做直线运动
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