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考古工作者�现最古老的生物化石均为水生生物并且在越早形成的地层里水生生物的化石越多在越晚形成的地层里陆生生物的化石越多．这一事实 Template






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tomski考古工作者�现最古老的生物化石均为水生生物并且在越早形成的地层里水生生物的化石越多在越晚形成的地层里陆生生物的化石越多．这一事实 coloring
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