题目

The little boy still needs the ______ 20 dollars to do with some things ___________.       A. remained; remained to settle                     B. remained; remaining to settle C. remaining; remained to be settled              D. remaining; remaining to be settled 答案：D某电场的电场线分布如图所示，以下说法正确的是  （　　）A．c点场强大于b点场强B．a点电势小于b点电势C．若将一试探电荷+q由a点释放，它将沿电场线运动到b点D．若在d点再固定一点电荷-Q，然后将一试探电荷+q由a移至b的过程中，电势能减小