About________of the books in our school library are written in Chinese．A.four-fifthB.four-fifthsC.fourth-fifthsD.fourths-fifth
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B解析分析：分数的构成，分子用基数词，分母用序数词，中间有-，如果分子大于1，分母要用复数形式：one-third，two-thirds(延伸)特殊的分数：1/2 a(one) half，1/4 one-fourth，a(one)quarter，3/4 three-fourths，three quarters．