题目内容

About _______ of the books in our school library are written in Chinese.
A．four-fifthB．four-fifths
C．fourth-fifthsD．fourths-fifth
B

试题分析：此题考查分数的表示方法。分数在英语中通常是借助于基数词和序数词来共同表达的。其中基数词表示分子，序数词表示分母。分子超过1，分母要加s.分数修饰名词时，若该名词是不可数名词只能用单数；若是可数名词，用单数或复数均可。但是，若它们在句子中作主语，则谓语动词是用单数还是复数取决于名词，即与分数所修饰的名词保持一致。根据语境可知此句的含义是我校图书馆的书大约4/5是汉语的。故选B。
点评：对于分数的考点有这么几个。第一是分子和分母的表示，到底是用基数词还是用序数词。第二，分子超过1时，分母的变化；第三分数做主语时谓语动词的取决，到底是用单数还是复数。
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