【单选题】【消耗次数：1】
美国公民没有以下哪个证件（ ）。
①
护照
②
身份证
③
社会保障号
④
驾驶证
参考答案：
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【单选题】
利用DTD给“公民”元素定义名称为“身份证号”的属性，该属性取值唯一且不可缺省，下面哪个选项（）正确？
①
!ATTLIST公民身份证号ID#REQUIRED
②
!ATTLIST公民身份证号IDREF#REQUIRED
③
!ATTLIST公民身份证号ID#IMPLIED
④
!ATTLIST公民身份证号ID#FIXED
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