事物发展的源泉和动力是（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28720' and id < 2342678 and id<>'2342678' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28720' and id > 2342678 and id<>'2342678' order by id asc limit 5