题目内容
20．It is my grandma'sninetieth（ninety） birthday．分析 这是我奶奶九十岁的生日
解答 答案：ninetieth，
提示词ninety是基数词意为"九十"根据题干里的表述"这是我奶奶九十岁的生日"，表顺序，作定语修饰后面的名词birthday，故用ninety的序数词ninetieth，
点评 本题主要考查完成句子，首先要根据所给单词提示，然后根据句式特点，结合句意和词性，确定单词的适当形式，最后把句子补充完整．本题主要考查序数词，序数词前面如果有名词所有格来修饰时不用定冠词the，在本题中还要注意序数词ninetieth的拼写
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