题目内容
11．September is theninth（第九） month of the year．分析 九月是一年当中第九个月．
解答 答案：ninth，结合句意九月是一年当中第九个月．故用序数词，nine是基数词，ninth是序数词"第九"，去e加th．故答案是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．比如：May-first （5月1日）在英语中，使用序数词时前面要加定冠词 the．
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