幼儿园应供给儿童合理膳食，保证膳食平衡，正餐间隔时间为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27889' and id < 2291208 and id<>'2291208' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27889' and id > 2291208 and id<>'2291208' order by id asc limit 5