下列叙述中正确的是 A.物种灭绝是一种偶然的不幸事件 b.地球上的物种以生活在热带雨林和珊�礁中的物种最丰富 C.化石证据表明 Template




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tomski下列叙述中正确的是 a.物种灭绝是一种偶然的不幸事件 b.地球上的物种以生活在热带雨林和珊�礁中的物种最丰富 coloring