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在某个经常刮大风的海岛上有许多无翅或残翅的昆虫形成这种适应性是由于 A．自然选择 B．人工选择 C．海岛上食物中缺乏翅生长的物质 D．海岛 Template






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tomski在某个经常刮大风的海岛上有许多无翅或残翅的昆虫形成这种适应性是由于 a．自然选择 b．人工选择 coloring
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