江苏省2013年高三英语考前赢分30天第03天.doc

江苏省 2013 年高三英语考前赢分 30 天第 03天考前赢分第 3天爱念才会赢核心知识数词的用法表示数目多少或顺序多少的词叫数词, 数词分为基数词和序数词。表示数目多少的数词叫基数词;表示顺序的数词叫序数词。一、基数词 1 )基数词一般可写成如 345 或 three hundred and forty-five 。 2 )基数词一般是单数形式,但遇下列情况,常用复数: of 短语连用, 表示概数, 不能与具体数目连用,如 scores of people 指许多人; b. 在一些表示“一排”或“一组”的词组里。例如: They arrived in twos and threes. 他们三三两两的到了。 c. 表示“几十岁”。 d. 表示“年代”,用 in +the + 数词复数。 e. 在乘法运算的一种表示法里,如 Three fives is( are ) fifteen 。二、序数词序数词的缩写形式如 first —1 st; second —2 nd; thirty-first — 31st 等。三、数词的用法 1 )倍数表示法 a. 主语+ 谓语+ 倍数(或分数) + as+ adj. + as。例如: I have three times as many as you. 我有你三倍那么多。 b. 主语+ 谓语+ 倍数(或分数) + the size ( amount , length …); of…。例如: The earth is 49 times the size of the moon. 地球是月球的 49 倍。 c. 主语+ 谓语+ 倍数(或分数) + 形容词(副词)比较级+ than …。例如: The grain output is8 percent higher this year than that of last year. 今年比去年粮食产量增加 8%。 d. 还可以用 by+ 倍数,表示增加多少倍。例如: The production of grain has been increased by four times this year. 今年粮食产量增加了 4 倍。 2 )分数表示法的构成:基数词代表分子,序数词代表分母。分子大于 1 时,分子的基数词用单数,分母序数词用复数。例如: 1/3 one-third; 3/37 three and three-sevenths 经典例题 1. Mr. Smith ________ me to buy several ________eggs for the dinner party. A. asked; dozen B. suggested; dozens of C. had; dozen D. persuaded; dozens 2. It is not rare in ______that people in ______ fifties are going to university for further education. A. 90s; the B. the 90s; / C. 90s; their D. the 90s; their 3. It is reported that the United States uses ________