ha ha ha.

来源: smart 于 2013-03-26 19:41:35 [] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (565 bytes)

My son is 7th grade and is qualified for the duke tip grand ceremony. I do not think he has any chance to solve this question. Really look up to those genius kids.

co:  比不了，就不费那劲了。 -乐了

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