题目内容
1．Mr．Green got her mother a pet cat for herninety-ninth （ninety-nine） birthday．分析 格林先生给他妈妈一只宠物猫作为她九十九岁的生日礼物．
解答 答案：ninety-ninth．根据句意这里是说她的99岁的生日，也就是第九十九个生日，用序数词，所给ninety-nine，其序数词是去e加th，故答案是ninety-ninth．
点评 序数词是数词的一种，主要在英语语法中讲到，在汉语中表示为"第几"．此外，在生日中，描述你出生的日期时，也用到了序数词
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