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

試題分析:此題考查分數(shù)的表示方法。分數(shù)在英語中通常是借助于基數(shù)詞和序數(shù)詞來共同表達的。其中基數(shù)詞表示分子,序數(shù)詞表示分母。分子超過1,分母要加s.分數(shù)修飾名詞時,若該名詞是不可數(shù)名詞只能用單數(shù);若是可數(shù)名詞,用單數(shù)或復(fù)數(shù)均可。但是,若它們在句子中作主語,則謂語動詞是用單數(shù)還是復(fù)數(shù)取決于名詞,即與分數(shù)所修飾的名詞保持一致。根據(jù)語境可知此句的含義是這所學(xué)校的學(xué)生大約有四百人,其中五分之三的是男生。表示…的數(shù)量要用名詞短語the number of,五分之三要用three fifths, 故選B。
點評:對于分數(shù)的考點有這么幾個。第一是分子和分母的表示,到底是用基數(shù)詞還是用序數(shù)詞。第二,分子超過1時,分母的變化;第三分數(shù)做主語時謂語動詞的取決,到底是用單數(shù)還是復(fù)數(shù)。
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