Module 5 A Lesson in a Lab Vocabulary and speaking 课件 （外研版必修1）.pptVIP

* 外研版 高一年级 (必修1) Module 5 Vocabulary and speaking 英语中基数词、序数词、分数、小数和百分数的读法 1. 基数词的读法： A. 先说“几十”， 再说“几”，中间用连字符。如： 23— 89— B. 先说“几百”， 再加and,再加末两位数（或末位数）。如： 223— 416— 809— twenty-three eighty-nine two hundred and twenty-three four hundred and sixteen eight hundred and nine C. 1000以上的数先从后向前数，每三位数加一“,”（千分位）；第一个“,”号前为thousand; 第二个“,”号前为million; 第三个“,”号前为billion。如： 1,001— 4,000— 9,743— 174,301— 750,000,000— one thousand and one four thousand nine thousand, seven hundred and forty-three a (one) hundred and seventy-four thousand, three hundred and one seven hundred and fifty million 2. 序数词的读法 序数词一般以与之相应的基数词加词尾-th构成，如：tenth（第十），但下面这些基数词在变序数词时， 有特别的地方。如： A. one — two — three— five— eight — nine— twelve— first second third fifth eighth ninth twelfth B. 以-ty结尾的词，要先变-y为-i，再加-eth。如： twenty— forty— C. 以one, two, three, five, nine收尾的多位数词，要照第一条方法变。如： twenty-one— twenty-two — thirty-five — ninety-nine— a hundred and fifty-three — twentieth fortieth twenty-first twenty-second thirty-fifth ninety-ninth a hundred and fifty-third 基数词表示分子，序数词表示分母，除了分子是“1”的情况外，序数词要用复数。如： ?— 2/3— 7/9— 5/12— — — one-fourth two-thirds seven-ninths five-twelfths two and three-fifths thirty and seven-eighths 3. 分数词的读法 2 3 5 30 7 8 一些特殊的表达法 ?— ?— ?— a / one half a / one quarter three quarters 4. 小数的读法 7.8— 0.4— 0.03— 0.125— 14.397— seven point eight zero point four zero point zero three zero point one two five fourteen point three nine seven 5. 百分数的读法 27% — 45% — 86% — twenty-seven percent forty-five percent eighty-six percent Can you say the following in English correctly? 1,000 2,000 12,000 112,000 796,000 one thousand two thousand twelve thousand one hundred, twelve thousand seven hundred, ninety-six thousand 879,457 eight hundred, seventy-nine thousand, four hundred and fifty-seven 1,000,000 9,