下列关于动物知识的叙述中除哪项外都是不正确的 A.水螅是只含有两个胚层的动物b.海参是一种腔肠动物c.蝗虫可以生活在陆地上的一个重要原因是 Template




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tomski下列关于动物知识的叙述中除哪项外都是不正确的 a.水螅是只含有两个胚层的动物b.海参是一种腔肠动物c.蝗虫可以生活在陆地上的一个重要原因是 coloring