基数词序数词的表达和用法-1.ppt

four thousand, three hundred and twenty-one seven million,six hundred and fifty four thousand, three hundred and twenty-one 7,654,321 1,987,654,321 4321 4,321 one billion, nine hundred and eighty-seven million,six hundred and fifty-four thousand, three hundred and twenty-one 1. hundred thousand (表示具体数字) million billion 2. hundreds thousands (表示概数) millions billions 三.基数词的用法 数词 (several)+ + of 基数词的用法 1、表示具体数目,hundred, thousand, million不用复数 表示不确定数目,用复数。即hundreds of(数百), thousands of(数千), millions of(数百万)+ 名词复数。 1) Our country has a population of 1,300 million people. 2) There are several thousand students in our school. 3) After the war, thousands of people became homeless. 作业 7046534210 178346790 1254321307 4283216547 6704653421 817034679 3120432130 9428320654 warming up 1. _______ tress were planted on the mountain last year. 　A. Thousands of B. Thousand of C. Five thousand of D. Five thousands. 2．______ of the students are girls in our class． A．Two three?B．Two threes C．Two thirds?D．Second three 3.----When was he born? ----He was born on ________. A. second of October B. the October three C. October the second D. three of October * 1. — If a = 3, b=4, what’s the answer to the problem, a+2ab+1=? — the answer is___. A. twenty eight B. twenty-eighth C. twenty-eight 2. In our school about five __ students are able to surf the Internet . A. hunderd of B. hunderds of C. hundred 3. __ sheep were killed in the accident. A. Thousand of B. Thousand C. Thousands of 4. There are over nine __ workers in the factory, but __ of young people hope to work in it. A. hundred 0f; hundreds B. hundred; hundreds C. hundreds; hundred 5. people in the world are sending information by e-mail every day. A.Several million