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1、Unit7What’sthehighestmountainintheworld?SectionA1a-2d亳州九中董宣LanguageGoal:TalkaboutgeographyandnatureGrammarFocus(一)数词Numeral数词是用来表示事物的数目和顺序的词。数词的分类：1.基数词2.序数词3.分数词今天我们先来学习一下基数词。1.复习1—100以内的所有数字。2.掌握百、千、万、十万、百万的表达法。1、1-19的基数词one1two2three3four4five5six6seven7eight8nine9ten10eleven11twelve12th
2、irteen13fourteen14fifteen15sixteen16seventeen17eighteen18nineteen192、20—90等十位数twenty20thirty30forty40fifty50sixty60seventy70eighty80ninety90twenty-one21twenty-two22………………其它的十位数照此类推，如：thirty-one31forty-two42seventy-five75ninety-six963、百、千、万百hundred100onehundred200twohundred以此类推····千thousand1
3、000onethousand2000twothousand·········英语里没有“万”这一单位，万也用thousand表示。如：10000tenthousand一万20000twentythousand两万·····4、十万、百万十万的说法是：100.000a(one)hundredthousand200.000twohundredthousandmillion百万a(one)million1,000,000twomillion2,000,000········以此类推······8,000,000eightmillion练一练345100118,657,421thre
4、ehundredandforty-fiveonethousand(and)oneeighteenmillion,sixhundredandfifty-seventhousand,fourhundredandtwenty-oneTheprojectlasted5yearsandcost2billiondollars.2.TheChinesehavebeenmakingpaperfortwothousandyears.3.Onethousandpoundsisalotofmoney.表示确定数量时用基数词+hundred，thousand，million，billion多位基数词
5、读法457890608389threehundredandeighty-ninefourhundredandfifty-seveneighthundredandninetysixhundredandeight1）101~999的三位数由“百位数＋and+两位数组成”。如：325—threehundredandtwenty-five102onehundredandtwo635sixhundredandthirty-five2)三位数以上的数，从个位往前数，每三位数加一个逗号，从后往前数的第一个逗号代表thousand,第二个逗号代表million,第三个逗号是billion，注
6、意这几个词不能用复数形式，后也不能加and。例如：2,648twothousand,sixhundredandforty-eight16,250,064sixteenmillion,twohundredandfiftythousand,sixty-four确切数目与不确切数目的表达：hundred,thousand,million,billion等前面有基数词，表示确切数目时，用单数，后直接接复数名词；如：threehundredbooksonehundredpeoplefivethousandstudentssevenmillionstarts表示不确切数目时，这类词后加-
7、s且与of连用。如：hundredsofpeoplethousandsofstudentsmillionsofbirdsbillionsoflions注意：这类短语中，名词前如有定冠词、指示代词或形容词性物主代词时，可加of,但表示的是范围。如：twohundredoftheworkers工人中的二百（人）Qomolangmaabout9,600,000squarekilometersinsizeTheSahara1,025metersdeepTheCaspianSea6,671kilometerslo
