句式:
(among the groups of various economic activities,)(介词结构做状语)
【the retired】(主语) 【read】(谓语)
【newspapers, weeklies and books】(宾语) (in the highest ratio)(状语),
and ratio is 50%.
1—among the groups of various economic activities:在形形色色的经济活动中
among为介词,表示“在……之间”
economic activities 经济活动
2—the retired: 退休人士. the + adj. 表示一类人.
newspaper, weeklies, books是并列的宾语.
这句话说:退休人士阅读比例最高的就是报纸、周刊、书籍.这个比例达到了50%之多.