内容正文:
Unit2 Amazing Numbers
⭐Section 2导学案
学习目标
1. 掌握基数词读法写法规则(hundred/thousand/million/billion 不加复数后缀、百位和十位之间加 and);掌握序数词构成规则、不规则序数词变形,区分基数词(计数)和序数词(表示顺序)用法;
2. 完成世界长河、高山数据问答句型练习,熟练读写各类基数大数、序数词排名表达;
3. 双人完成地理数据问答对话,正确运用基数词描述长度 / 高度数值、序数词描述排名顺序;
4. 能够准确读写、运用英语数字,学会用英语表达数据信息,了解世界地理数据,感受数字在信息表达中的作用。
一、预习案(课前自主完成)
(一)词汇 & 语法预习・基础过关
模块 A:基数词 Cardinal numbers — 用于计数、描述数量 / 数值
1. 基础基数词
eleven 11, twelve 12, fifteen 15, eighteen 18, twenty 20, fifty 50
eighty-two 82, ninety-eight 98, one hundred 100
three hundred and seventy-five 375
four thousand one hundred and eighty-nine 4,189
one thousand 1,000, one hundred thousand 100,000
one million 一百万,two million 两百万,one billion 十亿,three billion 三十亿
2. ✅核心基数词规则
· hundred, thousand, million, billion 前面有具体数字时,不加 s
✅ three hundred ✅ two million
❌ three hundreds ❌ two millions
· 百位和十位之间通常加 and
three hundred and seventy-five
3. 地理主题词汇
river 河流;kilometre (km) 千米;mountain 山峰;metre (m) 米;continent 大洲
Nile River 尼罗河;Amazon River 亚马逊河;Yangtze River 长江
Mt. Qomolangma 珠穆朗玛峰
模块 B:序数词 Ordinal numbers — 用于表达顺序、排名
1. 基础序数词
1st first, 2nd second, 3rd third, 4th fourth, 5th fifth, 8th eighth, 9th ninth, 11th eleventh, 12th twelfth, 13th thirteenth, 20th twentieth, 21st twenty-first
2. ✅核心序数词规则
· 大部分序数词:基数词 + -th
· 特殊不规则:first, second, third
· 二十以上复合序数词:只改变最后一位数字
twenty-first (21st), twenty-second (22nd), twenty-third (23rd)
3. 用法区别
· 基数词:回答 How many / How long / How high — 描述数量、尺寸、数值
It is 6,671 km long.
· 序数词:回答 Which / What rank — 描述排名顺序
The Nile River is the first longest river in the world.
4. 核心句型抄写 + 中英对照
①The Nile River is the first longest river in the world. It is about 6,671 km long.
译:尼罗河是世界第一长河,全长约 6671 千米。
②Mt. Qomolangma is the tallest mountain in Asia. It is 8,848.86 metres high.
译:珠穆朗玛峰是亚洲最高山峰,海拔 8848.86 米。
③The second highest mountain in Asia is Mt. Qogir, 8,611 metres high.
译:亚洲第二高峰是乔戈里峰,海拔 8611 米。
(二)预习思考题
1. 基数词 hundred/thousand/million 前面有具体数字时能不能加 s?百位和十位之间常加什么词?
2. 序数词基本构成规则是什么?三个不规则基础序数词是什么?21 的序数词写法是什么?
3. 基数词和序数词分别用来表达什么信息?
二、课堂探究案(课中小组合作完成)
(一)语篇问题链・研读世界长河、高山地理信息
基础信息
三条世界长河
· The Nile River(Africa):the first longest, 6,671 km
· The Amazon River(South America):the second longest, 6,480 km
· The Yangtze River(Asia):the third longest, 6,300 km
主要高山
· Asia
1st Mt. Qomolangma: 8,848.86 m
2nd Mt. Qogir: 8,611 m
3rd Mt. Kanchenjunga: 8,586 m
· North America
1st Mt. Denali: 6,190 m
2nd Mt. Logan: 5,959 m
3rd Pico de Orizaba: 5,610 m
· Africa
1st Mt. Kilimanjaro: 5,895 m
2nd Mt. Kenya: 5,199 m
3rd Mt. Stanley: 5,109 m
进阶理解问题链(语法用法梳理)
1. 基数词:描述长度、高度、精确数值
· 句型:It is ... metres /kilometres long /high.
· 大数读法重点:three hundred and seventy-five;four thousand one hundred and eighty-nine
· 易错点:five hundred ✅ five hundreds ❌
2. 序数词:描述排名顺序
· 句型:... is the ...-est ... mountain /river in ...
· 易错变形:twentieth, twenty-first
3. 语篇主线:结合真实世界地理数据,在真实语境中区分基数词数值表达、序数词排名表达
深度思辨讨论题
How do we use cardinal numbers and ordinal numbers in daily life? Give examples.
(二)合作探究・小组课堂活动(4 人一组)
活动 1:数字朗读练习
分组朗读基数大数和序数词,互相纠正读法与拼写
活动 2:双人问答对话练习
模板:
S1: Which is the first longest river in the world? Where is it? How long is it?
S2: The Nile River is the first longest river. It’s in Africa. It’s about 6,671 km long.
S1: Which is the second highest mountain in Asia?
S2: It is Mt. Qogir. It is 8,611 metres high.
活动 3:数字改错练习
修正错误写法(如 three hundreds /twenty one)
(三)分层输出任务
迁移 1:基础口头输出(达标)
基础 4 句
The Amazon River is the second longest river. It is 6,480 km long.
Mt. Qomolangma is the first highest mountain. It is 8,848.86 metres high.
迁移 2:双人综合问答对话(提升)
A: What is the third longest river in the world?
B: The Yangtze River. It is 6,300 km long and it is in Asia.
A: What is the tallest mountain in Africa?
B: Mt. Kilimanjaro. It is 5,895 metres high, and it is the first highest mountain in Africa.
迁移 3:书面综合数据介绍短文
标题:Famous rivers and mountains
写作框架
1. 介绍三条世界长河:序数词排名 + 基数词长度
2. 介绍各大洲前三高峰:序数词排名 + 基数词海拔
3. 正确区分基数词、序数词用法,规范拼写读法
三、课后拓展案(分层巩固作业)
基础层(全体必做)
1. 抄写背诵基数词、序数词表格,牢记核心语法规则;
2. 仿写 5 句基数词 + 序数词地理描述句子;
3. 朗读大数、序数词发音。
提升层(中等学生选做)
1. 双人完成地理数据问答对话;
2. 完成基础数字改写、句型转换练习;
3. 80 词左右完成世界著名河流山脉介绍短文。
培优拓展层(学有余力)
1. 1 分钟口语展示:介绍三大长河 / 三大高峰;
2. 制作基数词 & 序数词记忆卡片,标注易错点;
3. 查阅一条本地河流 / 山峰数据,用英语描述排名和尺寸。
课堂小结(板书核心)
1. Cardinal numbers(基数词):描述数量 / 数值 / 尺寸
· 规则:具体数字 + hundred/thousand/million(不加 s);百位加 and
· 例:three hundred and seventy-five, two million
2. Ordinal numbers(序数词):描述顺序 / 排名
· 基础:1st first, 2nd second, 3rd third, ... 21st twenty-first
· 复合序数词只变最后一位
3. 句型模板
· 数值:It is ... km /metres long /high.
· 排名:... is the ...-est ... in ...
当堂五分钟检测
一、写出序数词
1. 20 ________
2. 21 ________
3. 12 ________
4. 9 ________
二、正确写法改错
1. three hundreds → ________
2. two millions → ________
3. three hundred seventy-five → ________
三、单项选择
1. The Nile is the ______ longest river in the world.
A. one B. first C. once
2. The Yangtze River is about ______ kilometres long.
A. six thousand three hundred
B. six thousands three hundred
C. six thousand three hundreds
3. Mt. Qomolangma is 8,848.86 ______ high.
A. metre B. metres C. metre’s
四、句子翻译
1. 尼罗河是世界第一长河,位于非洲,全长约 6671 千米;亚马逊河是世界第二长河,全长 6480 千米;长江是世界第三长河,全长 6300 千米,位于亚洲。
2. 珠穆朗玛峰是亚洲第一高峰,海拔 8848.86 米;乔戈里峰是亚洲第二高峰,海拔 8611 米;干城章嘉峰是亚洲第三高峰,海拔 8586 米。
3. 基数词用来描述长度、海拔、数量等数值;序数词用来表达排名和顺序;有具体数字修饰时 hundred, thousand, million 不加复数后缀。
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