题目

三个间距相等，带电量分别为一qA、一qB、qC的点电荷A、B、C，产生的电场线分布如图所示，具有对称性。图中a、b两点处的场强大小分别为Ea、Eb，将某正检验电荷从电场a点移到b点电场力做功为W，其在a、b两点时的电势能分别为εa和εb，则下列判断正确的是    A．Ea< Eb    B．qA< qB     C．W > 0     D．εa < εb The children all turned ____ the famous actress as she entered the classroom. A. looked at                  B. to look at C. to looking at               D. look at