题目内容
15．He lives on thetwentieth （twenty） floor，so he has a better view．分析 他住在二十楼，所以他有很好的视野．
解答 答案：twentieth．用floor表示楼层时，前面加序数词，这里是基数词twenty，故用序数词twentieth
点评 分清基数词和序数词的不同，更要掌握序数词的变化规则
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