—Do you enjoy _____ music? —Of course I do. A. listening B. listen to C. listening to D. to listen to 答案:C enjoy doing sth.“喜欢做……”,listen to后接名词作宾语。(2013?增城市一模)如图所示,a,b,c是一条电场线上的三点,电场线的方向由a到c,a,b间距离等于b,c间距离,用?a,?b,?c和Ea,Eb,Ec分别表示a,b,c三点的电势和场强,可以判定( )A.Ea=Eb=EcB.Ea>Eb>EcC.?a-?b=?b-?cD.?a>?b>?c