食草动物可以从草中获取营养物质是因为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29807' and id < 2419231 and id<>'2419231' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29807' and id > 2419231 and id<>'2419231' order by id asc limit 5