一份试卷的难度系数越大，说明这份试卷（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31696' and id < 2537488 and id<>'2537488' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31696' and id > 2537488 and id<>'2537488' order by id asc limit 5