知了的生命周期
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知了的生命有三个阶段。
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第一个阶段作为卵，在树梢里生活10个月左右。
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然后卵孵化成为幼虫。
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幼虫被风刮到地上，在地上奋发钻一个洞。
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在洞里面藏着知了花大部分生命。
在洞里面藏着知了花了大部分生命。
这是第二个阶段。
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几年后（5-17年）知了幼虫爬出来，选个地方蜕皮，终于成为成年知了。
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此时它们留下的生命只有两个星期了。
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公知了大声喊叫吸引母知了。
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繁衍了后代，知了的生命就结束了。
繁衍了后代后，知了的生命就结束了。