题目内容

The number of the students in our grade _______about ______，and     of them are girls.
A．are, six hundreds, two- thirdsB．is, six hundred, two- third
C．is, six hundred, two thirdsD．are, six hundreds, two third
C

试题分析：句意:我们年级的学生的数目是大约六百人,并且他们中三分之二是女生.前文主语The number表示抽象含义,不可数,故用单数形式. 英语中数词表示概数时，后面加s，和介词of搭配使用。用原形时表示具体数字和数词搭配使用。结合语境可知本句中是表示具体数字,故用原形. 英语中一般用基数词表示分数的分子，用序数词表示分数的分母,中间不用短横线连接。当分子是一时，分数的分母用单数形式，在表示分数时，当分数的分子大于一时，分数的分母要用复数形式。由短横线连接的两个名字构成的是复合词,故选C.
点评：be动词往往根据句子的主语而有所不同，其应用原则可以结合如下歌谣来记忆；我用am，你用are；is用在他、她、它。单数名词用is，复数名词全用are。英语中数词的用法比较固定,学习中注意总结,熟记即可.
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