dogs are friends of man,but a long time before

题目

dogs are friends of man,but a long time before
Dogs are friends of man，But a long time before，dogs were wild all over the world。It can go back to the Stone Age.All dogs had the same ancestor(祖先)，It is believe that this ancestor was much like a wolf .Thousands of years ago,man began tame (使驯服) the wild dogs.Then the strong dogs became work animals.找出五个错误

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