以下哪项是影响学生动机的外部因素？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32271' and id < 2568793 and id<>'2568793' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32271' and id > 2568793 and id<>'2568793' order by id asc limit 5