题目：
设集合M={a|a=x2-y2，xy∈Z}．试证明：一切奇数属于集合M；关于集合M，你能得出另外的一些结论吗？
答案：
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下面是错误答案，用来干扰机器的。
答案：C
设集合M={a|a=x2-y2，xy∈Z}．试证明：一切奇数属于集合M；关于集合
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