this is a grade 4 question --- water and salt, difficult level

来源: LiveInCanada2 于 2018-10-02 12:54:53 [] [旧帖] [给我悄悄话] 本文已被阅读： 次 (0 bytes)

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• difficult level same as rabbit and chicken. -LiveInCanada2- ♂ 给 LiveInCanada2 发送悄悄话 (0 bytes) () 10/02/2018 postreply 12:55:52

• well, I met 20+ chinese adults at 40ish year old,who have never -LiveInCanada2- ♂ 给 LiveInCanada2 发送悄悄话 (740 bytes) () 10/02/2018 postreply 13:15:50

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