题目内容
18．Mark got a new bike from his uncle on hiseighth （第八） birthday．分析 马克在他八岁生日的时候他的叔叔送给他一辆新自行车．
解答 答案：eighth．句中his形容词性物主代词后用序数词，第八用eighth．
点评 此类单词填空题需要理解句意和掌握语法功能，本题考查序数词，eight的序数词直接加h即可
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