题目内容
11．Shanghai is now holding theforty-first（或 41st）．（四十一）World Expo（世博会）．分析 上海现在正在举办第四十一届世博会．
解答 答案：forty-first（或 41st）．如果基数词大于一的话，后面的名词要用复数形式，比如three friends．根据"World Expo"是单数形式，所以不能基数词，结合定冠词the，那么就需要用序数词，根据汉语提示"四十一"，也即是第四十一，所以要用forty-first，或缩写为 41st．
点评 首先要掌握基数词和序数词的用法区别，还要掌握序数词的变化形式，然后根据给出汉语提示，就可以确定正确答案．
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