生物体的结构总是与其功能相适应的。根据下列图示。你认为河蚌的�吸器官是 A外套膜 b、贝壳 c、肺 d、鳃——青夏教育精英家教�—— Template




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tomski生物体的结构总是与其功能相适应的。根据下列图示。你认为河蚌的�吸器官是 a外套膜 b、贝壳 coloring