教师知识结构的核心是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32191' and id < 2565846 and id<>'2565846' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32191' and id > 2565846 and id<>'2565846' order by id asc limit 5