15．-We have sixty students in our class．      of them are boys．How many girls are there，do you know？
----There are twenty girls．（　�。�
A．One thirdB．Two thirdsC．One quarterD．A half

分析 --我們班有60個學(xué)生，他們當(dāng)中三分之二是男生．你知道有多少女生嗎？
--有二十個女生．

解答 答案：B．根據(jù)語境 of them are boys可知其前應(yīng)為某個數(shù)，結(jié)合各個選項給出的答案可知應(yīng)填分數(shù)，分數(shù)的表達形式為：基數(shù)詞（分子）+序數(shù)詞（分母），分子大于一時分母加s，在這里四個選項都表示的是分數(shù)，再根據(jù)There are twenty girls，可知女生有20人，總?cè)藬?shù)是60人，那么男生有40人，男生占總?cè)藬?shù)的三分之二，它的英語說法是Two thirds．故選B．

點評 本題考查分數(shù)的用法分數(shù)的表達形式為：基數(shù)詞（分子）+序數(shù)詞（分母），分子大于一時分母加s．考生在掌握基礎(chǔ)知識的基礎(chǔ)上結(jié)合語境可正確作答．

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