题目内容
11．-How old is your son？-_________．We had a special party for his _________ birthday yesterday．（ ）
| A． | Nine，nine | B． | Ninth，nine | C． | Nine，the ninth | D． | Nine，ninth |
分析 ---你儿子多大？
---九岁，我们昨天给他举办了一个特别的九岁生日会．
解答 答案：D．结合上文How old is your son？下文用基数词来回答，第二个空是表达第九个生日，故用序数词ninth，前有限定词his，省略the．故答案是D．
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）
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