现有以下四个结论：①绝对值等于其本身的有理数只有零；②相反数

现有以下四个结论：①绝对值等于其本身的有理数只有零；②相反数等于其本身的有理数只有零；③倒数等于其本身的有理数只有1；④平方等于其本身的有理数只有1．其中正确的有（）

A．0个 B．1个 C．2个 D．大于2个

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现有以下四个结论：①绝对值等于其本身的有理数只有零；②相反数

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