天然存在的孕激素主要是（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24971' and id < 2127411 and id<>'2127411' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24971' and id > 2127411 and id<>'2127411' order by id asc limit 5