题目内容
19．-How old is Kate？-_____．We had a special party for her _____ birthday yesterday．（ ）
| A． | Twenty； twentyth | B． | Twenties； twentieth | ||
| C． | Twenty； twentieth | D． | Twenties； twentyth |
分析 -Kate多大了？--20．昨天我们为了她的20岁生日举行了一个特殊的聚会．
解答 答案：C 根据问句how old可知这是询问年龄，需要用基数词回答．根据birthday，可知这是单数形式，其前的第20需要用序数词作定语修饰birthday．twenty-20（基数词）；twentieth第20（序数词）．故选C．
点评 本题考查基数词和序数词的辨析．序数词表示次数，其后跟的是名词的单数形式．
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