15．一What day is it today？
一It's Monday，and it's my ________ birthday．（　�。�
A．fifteenB．fifteenthC．the fifteenD．the fifteenth

分析 --今天星期幾？
--今天星期一，是我的十五歲生日．

解答 答案：B．
一般當序數(shù)詞用來指明先后的順序或一系列事物按照一定的規(guī)律排列時，要在該序數(shù)詞前面加定冠詞the，但當該序數(shù)詞前面有諸如his、her、their 等物主代詞或者其他修飾語時，則不用定冠詞the．根據(jù)題意"it's my ________ birthday"，表示"我的十五歲的生日"要用序數(shù)詞表述，修飾birthday，序數(shù)詞十五英語的表達法是fifteenth．故選B．

點評 本題考查數(shù)詞的用法．在做題時，要先分清句子缺少基數(shù)詞還是序數(shù)詞，并熟練掌握一些關(guān)于數(shù)詞的基本用法．

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