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Saturday, 2 May 2009

n年前的脑力激荡

一只蜗牛，跌进枯竭的井里，
它白天可以爬3米，晚上会下滑2米，
它在第几天才能爬出三十米深的井呢？

2 comments:

Anonymous said...: 28day ^^; 2 May 2009 at 14:27
Anonymous said...: 永远都爬不出
他缺水而死; 2 May 2009 at 16:13

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