— Did you know any French before you arrived in Washington? — Never ______ it, actually. A. had I learned B. have I learned C. I learned D. was I learning 答案:A如图所示,在一直线上分别固定正点电荷q1、负点电荷q2,在q2的右侧有a、b、c三点,其中b点的电场强度恰好为零.现将一个正检验电荷q从a点移到b点再移到c点,则在此过程中( )A、电贺q从a移到b过程中,受到向右的电场力作用B、电贺q从b移到c过程中,受到向右的电场力作用C、检验电荷q的电势能先减小后增大D、检验电荷q的电势能先增大后减小