学生往往会“度德而师之”。因此要求教师应扮演好（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30339' and id < 2452621 and id<>'2452621' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30339' and id > 2452621 and id<>'2452621' order by id asc limit 5