探索性题:用放大镜观察苍蝇的脚,看看脚有什么特点?想想苍蝇为什么能站在天花板上或窗玻璃上不掉下来?参考解答:首先,苍蝇用6只脚行走有一套本领。苍蝇身体左右两侧,每侧的前、后脚与对侧的中脚组成1个“三角形”,共组成了2个“三角形”。当第一个“三角形”提起向前跨出时,另一个“三角形”就支撑身体,保持身体的平衡。这样,苍蝇不仅能在凹凸不平的物体上行走,还为在摆动着的物体上爬行创造了条件。其次,苍蝇每只脚的末端都有一对钩爪和爪垫。像钳子一样的钩爪,加上钢硬的脚毛的配合,容易夹住物体,支撑身体,而在脚抬起时,又能自动松开物体;脂质的爪垫上 Explore the issue: Use a magnifying glass to observe the flies’ feet and see what the characteristics of the feet. Think about why the flies can stand on the ceiling or the windowpane does not fall. Reference solution: First of all, flies with a 6-foot walking skills. Flies body left and right sides, each side of the front and rear legs and the contralateral foot to form a “triangle”, composed of a total of 2 “triangle.” When the first “triangle” is lifted forward, the other “triangle” supports the body and maintains the body’s balance. In this way, flies can not only walk on uneven objects, but also create conditions for crawling on swaying objects. Second, the flies have a pair of hook and paw pads at the ends of each foot. Claws like the pliers, coupled with the hard steel legs with the hair, easy to hold the object, supporting the body, and when the feet are lifted, but also automatically release the object; lipid claw pad