well, I met 20+ chinese adults at 40ish year old,who have never

来源: LiveInCanada2 于 2018-10-02 13:15:50 [] [旧帖] [给我悄悄话] 本文已被阅读： 次 (740 bytes)
本文内容已被 [ LiveInCanada2 ] 在 2018-10-02 13:26:34 编辑过。如有问题，请报告版主或论坛管理删除.
回答: difficult level same as rabbit and chicken. 由 LiveInCanada2 于 2018-10-02 12:55:52

these elementary questions,

rabbit and chicken

Water piping in and Water piping out.

Chase and Meet

Train and Tunnel

Water and Salt

Shortage and Excessives.

Boat travels in a running river

Team work at a combined speed.

 

 

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