学生在阅读时划重点线，利用了知觉的（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30473' and id < 2461633 and id<>'2461633' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30473' and id > 2461633 and id<>'2461633' order by id asc limit 5