16-year-old students in England should understand fifteen _______ words.
A．thousandB．thousandsC．thousand ofD．thousands of
A

試題分析：英語中數(shù)詞表示概數(shù)時，后面加s，和介詞of搭配使用。用原形時表示具體數(shù)字和數(shù)詞搭配使用。句意：英國16歲的學生需要理解一萬五千個單詞。結合語境可知本句描述具體數(shù)字，故選A。
點評：英語中關于hundred、thousand和million三個數(shù)詞的用法只需要記住一個原則就行。即；前有數(shù)詞則不加s，加s必加of。
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