谢谢.哎,有时候教他数学会很生气.因为我们都觉得哪些是显而易见的东西啊.已经教了两年多还这样...

来源: 米米熊于 2011-10-06 19:20:27 [旧帖] [给我悄悄话] 本文已被阅读：次

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