布置课外作业的目的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29182' and id < 2374264 and id<>'2374264' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29182' and id > 2374264 and id<>'2374264' order by id asc limit 5