布置课外作业的目的是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='31416' and id < 2518392 and id<>'2518392' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31416' and id > 2518392 and id<>'2518392' order by id asc limit 5