祖父用纸给孙子做了一条长龙。长龙腹腔的空隙仅仅能容纳几只蝗虫，投放进去，它们都在里面死了，无一幸免！
祖父说：“蝗虫性子太躁，除了挣扎，它们没想过用嘴巴去咬破长龙，也不知道一直向前可以从另一端爬出来。因而，尽管它有铁钳般的嘴壳和锯齿一般的大腿，也无济于事。
可当祖父把几只同样大小的青虫从龙头放进去，然后关上龙头，奇迹出现了：仅仅几分钟，小青虫们就从龙尾爬了出来。
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