The dog has always been noted for ______. [br] The article does not mention whet

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问题 The dog has always been noted for ______. [br] The article does not mention whether the scientists’ experiments with dogs have ______.

选项 A、benefited animals other than dogs
B、served man
C、helped other dogs
D、contributed to medical knowledge

答案 A

解析利用排除法完成本题。B、C、D在文中已提到。

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