题目内容
20．This is our Art Room．Yours is on thethird（三） floor．分析 句意：这是我们的美术室．你们的在三楼上．
解答 答案：third．根据floor，可知这里考查的是对楼层的英语表示法．英语中一般用序数词加楼层来表示在几楼，结构所给单词，可知填three的序数词形式third，第三，作定语．故填third．
点评 本题考查序数词的用法．解答时注意序数词的构成：一般在词尾加th，但three的应单独记忆，是third．
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