【单选题】【消耗次数：1】
a?a=5，则∣a∣=（ ）
①
<img class="kfformula" src="20190809/1565319639836572.png" data-latex="5"/>
②
<img class="kfformula" src="20190809/1565319639359617.png" data-latex="\sqrt {5}"/>
③
<img class="kfformula" src="20190809/1565319639607345.png" data-latex="25"/>
④
<img class="kfformula" src="20190809/1565319639200781.png" data-latex="1"/>
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