英语语法,定语从句,mostofwhicharethoseAmongalloftheaboveactivities,achildcouldeitherbeinfluencedbyhisorherpeergroupespeciallywhenleftwithoutattentionorbeinfluencedbywhatheorshewatchesonTV,mostofwhichareth

　　英语语法,定语从句,mostofwhicharethose

　　Amongalloftheaboveactivities,achildcouldeitherbeinfluencedbyhisorherpeergroupespeciallywhenleftwithoutattentionorbeinfluencedbywhatheorshewatchesonTV,mostofwhicharethosenotmeanttobeviewedbythechild’sagegroup.此句话中which指代什么?those呢?是不是those可以省略?很不理解这句话为什么还要加个those