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Sharkshavelivedintheoceansforover450millionyears,longbe...
问题详情:Sharkshavelivedintheoceansforover450millionyears,longbeforedinosaursappeared.Therearenowabout360speciesofsharks,whosesize,behavior,andothercharacteristicsdifferwidely.Everyyear,wecatchandkillo...