题目内容
5．Today is histwentieth （第二十） birthday．分析 今天是他的第二十个生日．
解答 答案：twentieth；根据句中的汉语提示"第二十"，结合句中信息Today is his…（第二十） birthday．可知该单词用序数词形式twentieth，第二十；修饰名词birthday；故填twentieth．
点评 分析句子的语法结构特征，结合给出的汉语提示作答．
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