7、enafterwatchingnonviolentandviolentcartoons.Theyfoundthatthekidswhowatchedviolentcartoonsfoughtwithothersand__17__classrulesmoreoften.Childrenundertheageofsevenaretoo__18__tounderstandthattheviolenceonTVcanbring__19__realharm.Itisparents'job__20__themunderstandit.(C)11.A.are B