题目内容
15．-Do you know the boy who is sitting next to Peter？-Yes．He is Peter's friend．They are celebrating his____birthday．（ ）
| A． | nine | B． | ninth | C． | the ninth | D． | a ninth |
分析 -你知道挨着彼得坐着的男孩是谁吗？
-知道．他是彼得的朋友．他们正在庆祝他的第九个生日．
解答 答案：B．考点是序数词．根据his____birthday可知此处应用序数词，作birthday的定语．序数词用法的其中一条是：当序数词前面有形容词性物主代词或者名词来修饰时，应把定冠词the去掉；"他的第九个生日"是his ninth birthday；用nine的序数词ninth．故选B．
点评 在学习中掌握序数词的用法，拿到题后的再来判断它属于其中的哪一个用法，再做出选择．
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