好玩的。本来想看看大伙的答案再解释。是这样的，

来源: 于 2012-12-28 23:32:48 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

当年一家外出旅行，在车上闲着，就跟小朋友聊天。儿子四岁女儿五岁。忘了女儿答了没有，我儿子脱口而出的答案是这样的

3
24
C (not 3, interesting! Thus I asked the next question)
A (interesting indeed! I randomly came up with Q5 and expect him to get stuck)
V !! (I was impressed!)

Now he is at grade 9 and I think he will stuck for a few seconds and give different answers to Q4 and Q5.