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    the students in this school is about four thousand,      of them are boys.
A.A number of, three fifthB.The number of, three fifths
C.A number of, three fifthsD.The number of, three 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这所学校的学生大约有四百人,其中五分之三的是男生。表示…的数量要用名词短语the number of,五分之三要用three fifths, 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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