【弯道超车】Unit 6 Healthy diet 核心语法之数词-2025年沪教牛津版九年级英语上册精讲精练（含答案解析）

/ 让学习更有效 新课备课备考 | 英语学科 2025年沪教牛津版九年级英语上册精讲精练 Unit 6 Healthy diet 核心语法：数词 一、 基数词与序数词核心复习 基数词 (Cardinal Numbers): 表示数量（多少）。 例: one, twenty-five, a/one hundred, three thousand and sixty-eight 序数词 (Ordinal Numbers): 表示顺序（第几）。 例: first (1st), twenty-fifth (25th), hundredth (100th) 九年级重要提醒： hundred, thousand, million, billion 前有具体数字时，用单数；表泛指“成百上千”时，用复数 + of。 two hundred books (√) / two hundreds books (×) thousands of students (成千上万的学生) 二、 数词的核心进阶用法 1. 分数 (Fractions) 构成： 分子（基数词） + 分母（序数词） 当分子 > 1 时，分母的序数词要用复数。 读法： 1/2: one-half / a half 1/3: one-third 1/4: one-quarter / a quarter 或 one-fourth 2/3: two-thirds 3/5: three-fifths 1/100: one hundredth 例句： A/One third of the students are girls. 三分之一的学生是女生。 I've finished three quarters of the work. 我已经完成了四分之三的工作。 2. 小数 (Decimals) 读法： 小数点读作 point，小数点后的数字按个位基数词依次读出。 0.5: zero point five 3.14: three point one four 105.208: one hundred and five point two zero eight 例句： The bottle can hold 1.5 liters of water. 这个瓶子能装1.5升水。 3. 百分数 (Percentages) 读法： 数字 + percent (永远用单数) 25%: twenty-five percent 100%: one hundred percent 0.6%: zero point six percent 例句： About 80 percent of the earth's surface is covered by water. 地球表面大约80%被水覆盖。 I'm a hundred percent sure. 我百分之百确定。 4. 年代、年份与日期 年份： 通常分成两半来读。 1998: nineteen ninety-eight 2008: two thousand and eight 2020: twenty twenty 年代： 年份后加-s，前加the。 在20世纪90年代：in the 1990s (读作：in the nineteen nineties) 日期： 写法： 月份 + 序数词（或基数词） 读法： 序数词 5月1日: May (the) first 或 May 1st 在6月4日：on June (the) fourth 5. 编号表达 “名词 + 基数词”：强调顺序，常大写。 Room 305 (305房间) | Page 88 (第88页) | Lesson Ten (第十课) | Bus No. 9 (9路公交车) “the + 序数词 + 名词”：强调顺序。 the tenth lesson (第十课) 6. 倍数表达 (Important!) ... times + as + 形容词/副词原级 + as... This room is three times as large as that one. 这个房间是那个房间的三倍大。 ... times + the size/length/width/height of... This river is twice the length of that one. 这条河是那条河的两倍长。 ... times + 比较级 + than... This book is four times thicker than that one. 这本书比那本厚四倍。 7. 约数表达 (Approximate Numbers) “多于、超过”: more than, over, above over/above/more than 100 people 一百多人 “少于、不到”: less than, under, below less than/under/below 50 students 不到50名学生 “大约、左右”: about, around, approximately, or so about/around 20 books 大约20本书 twenty books or so 20本书左右 1． There are ____ students in our school. A．three thousands B．three thousands of C．three thousand D．thousand of 2．Football is so exciting that _____people in the world play it. A．million of B．millions of C．two millions of D．two millions 3．Come on, baby. We have already done _____ of the work. A．tw ... ...