【正文】 詞 s 在某人幾十歲時 nieen niies 1. There will be more chances in __ century than in __ century. A. twentyone, twenty B. twentyfirst, twentieth C. the twentyfirst, the twentieth 2. The city changed a lot ___. A. in 1980s B. in the 1980s C. in the 1980 3. He graduated in __ of __ century. A. the sixtieth。Numerals 構(gòu)成規(guī)律 基數(shù)詞 序數(shù)詞 1－ 12有各自獨立的形式。 hundreds C. hundreds。 △ by+倍數(shù)，表示增加多少倍 The production of grain has been increased by four times this year. 今年糧食產(chǎn)量增加了 4倍。s seven o39。 two thirds C. A number of。 前 多加 the，強(qiáng)調(diào) 順序 ： The first part. the third floor. 若加 a表示“ 又一，再一 ”，不強(qiáng)調(diào)順序 。 百位數(shù)，由百位數(shù)＋ and+兩位數(shù)組成。 are B. Two thirds。s fine. 2. That magnificent ____ pyramid was built by the Egyptian people. A. ninecenturiesold B. ninecentury39。s the date today? ____. A. It39。 is 2. __ of her money __ spent on clothes. A. Two three。 4－ 19都是在后面加上 th,特殊的有 fifth,eighth, ninth,twelfth。 序數(shù)詞可以用縮寫，如 1st, 2nd, 3rd ,4th… 一、數(shù)詞的分類 基數(shù)詞 序數(shù)詞 基數(shù)詞 序數(shù)詞 one twelve two twenty three twentyone four forty five one hundred six one hundred and five eight one hundred and twentynine nine nieen 一 .基數(shù)詞、序數(shù)詞 first second third fourth fifth sixth eighth ninth twelfth twentieth twentyfirst fortieth one hundredth one hundred and fifth one hundred and twentyninth nieenth 二 . 讀法（基數(shù)詞） 百位和十位間用 and 連接 , 十位和個位間用 連接 three hundred and twentyone 321 右往左數(shù) ,三位一組 ,逗號隔開 .依次是 thousand(千 ) million (百萬 ) billion (十億 ) four thousand three hundred and twentyone seven million,six hundred and fifty four thousand three hundred and twentyone 7,654,321 1,987,654,321 4321 4,321one billion ni