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If a is an integer, is b an integer? (1) The average (arithmetic mean) of a and b is an integer. (2) The average (arithmetic mean) of a, b, and b+4 is a.
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解析：
根据算数平均数的定义可知，本题应选D项。
根据算数平均数的定义可知，本题应选D项。
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