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- 某人带狼、羊以及蔬菜渡河,一小船除需人划外,每次只能载一物过河。而人不在场时,狗要吃羊,羊要吃菜,问此人应如何过河?-A person with a wolf, sheep and vegetables to cross the river, a boat need not only draw people outside, each containing an object across the river only. And the person' s absence, the dog