按照有机化合物的分类，单糖是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26290' and id < 2199208 and id<>'2199208' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26290' and id > 2199208 and id<>'2199208' order by id asc limit 5