社会保障的最髙层次是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29532' and id < 2402411 and id<>'2402411' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29532' and id > 2402411 and id<>'2402411' order by id asc limit 5