Unit 1 The Developing World Topic 2 What has happened to the population? SECTION B教案

Unit 1 The Changing World
Topic 2 China has the largest population.
Section B
The main activities are 1a and 2a. 本课重点活动是1a和2a。
Ⅰ. Teaching aims and demands 教学目标
1. Learn a new word:
increase
2. Learn some useful sentences:
(1) It says the world has a population of 6.5 billion.
(2) It is increasing by 80 million every year.
(3) Which country has the largest population
(4) —What’s the population of the U.S.A.
—It’s…
(5) So it is.
(6) The population problem is more serious in developing countries.
3. Go on learning the present perfect tense.
China has already carried out the one-child policy to control the population.
4. Go on learning to express the numbers with million and billion.
5. Make students realize the serious population problem and have social conscience.
Ⅱ. Teaching aids 教具
卡片/多媒体课件/录音机/世界人口示意图/小黑板
Ⅲ. Five-finger Teaching Plan 五指教学方案
Step 1 Review 第一步 复习(时间:8分钟)
复习现在完成时，然后引导学生谈论过去人们生活条件差的原因，引出人口问题，导入新课。
1. (小竞赛。教师把学生分为两组。然后出示写有already, yet, ever, never, just的卡片，要求学生以抢答形式迅速说出含有卡片上词的句子，要求用现在完成时。迅速且正确者赢一分，评出获胜组。)
T: Let’s have a contest to review the present perfect tense, OK
Ss: Great.
T: First, I’ll divide the whole class into two groups. Then I’ll show the cards with “already”, “yet”, “ever”, “never” and “just” one by one. Your team will get a score if you give me a correct sentence with the word on the card. Let’s go!
(教师出示写有already的卡片。)
T: “Already”, please!
Group 1: She has already finished her homework.
T: Congratulations. “Yet”, please!
Group 1: I haven’t watered the flowers yet.
T: Congratulations. Group 2. “Ever”, please!
Group 2: Has your sister ever been to Tibet
…
2. (教师让一名学生复述Section A中3a的内容，引出人口问题。)
T: Who can retell 3a in Section A
S1: I can.
(学生复述课文。)
T: Well done. Can you tell me why their living conditions didn’t seem to be very good in the past, S1
S1: Because the family members in the past were more than those nowadays.
S2: Because of the big population.
S3: China was not well developed.
T: Right. But what’s the population of China, do you know Let’s learn about it from 1a in Section B.
Step 2 Presentation 第二步 呈现(时间:14分钟)
用多媒体呈现图表，谈论中国及世界人口，呈现1a中重点句型及部分生词。
1. (多媒体展示1b中图表。)
T: Here is a chart about some countries’ population. What’s the population of our country
Ss: It’s 1.3 billion. (可帮助学生回答。)
(板书句型并要求学生掌握；理解billion。)
—What’s the population of China —It’s 1.3 billion.
T: Is China a developing country or a developed country
Ss: A developing country.
(板书并讲解。)
the developing/developed country
T: Good. Now please talk about other countries’ population in pairs.
(教师可先做示范，然后让学生进行练习。)
S1: What’s the population of …
S2: It’s …
S1: Is it a developing country or a developed country
S2: It’s a …
T: Well done. We have known some countries’ population. What’s the population of the world
S3: 6.5 billion.
T: Right. The world has a population of 6.5 billion. And the world’s population is increasing by 80 million every year.
(板书单词increase及短语has a population of，并要求学生掌握，延伸讲解increase by和increase to的区别。)
has a population ofincreaseincrease byincrease to
T: Look at the chart, which countries have the larger population, the developing countries or the developed countries
Ss: The developing countries. And the population in developing countries is growing faster.
T: So it is.
(板书So it is，讲解“so+代词/名词+助动词/be动词/情态动词”结构，并和“so+助动词/be动词/情态动词+代词/名词”的结构进行区分。)
So it is.
T: In order to solve the population problem, what policy does China carry out
Ss: One-child policy.
T: Yes. Now let’s listen to 1a and learn more about it.
2. (教师放1a录音，让学生听并尽可能地写出对话中的有关数字。)
T: Close your books, listen to the tape and try your best to write down the numbers you hear.
(教师再放录音，让学生核对写的情况。)
T: Open your books. Listen again and check what you have written.
(让学生朗读1a，师生共同解决疑难点。)
T: Read 1a and pay attention to the following sentences.
(教师板书并讲解这三个句子，使学生加深对文章的理解。)
(1) And it is increasing by 80 million every year.(2) It shows that the population in developing countries is larger than that in developedcountries, doesn’t it (3) China has already carried out the one-child policy to control the population.
Step 3 Consolidation 第三步 巩固(时间:8分钟)
根据1b绘制表格(教师可适当增加一些其他国家的人口)，学生通过对话及复述，巩固1a内容。
1. (让学生完成表格并进行链式问答。)
T: Look at the form. Then fill it out.
Country China India the U.S.A. Indonesia Brazil
Population
(核对答案。)
T: Great. I think you all have done well.
(学生两人一组进行问答练习。)
S1: What’s the population of China
S2: It’s about 1. 3 billion. What’s the population of India
S1: It is about 1. 1 billion. What about the U.S.A.
S2: …
2. (让学生试着复述1a内容。)
S3: The world has a population of 6.5 billion.
S4: China has the largest population, with 1.3 billion.
S5: The population in developing countries is growing faster.
…
T: OK. I think you have mastered the dialog. You can practice it by yourselves after class.
Step 4 Practice 第四步 练习(时间:10分钟)
通过复习千以内的数字，引出高位数字的读法，完成2a，2b。
1. (教师出示写有数字的小黑板。)
T: We have learnt about many countries’ population. Do you know how to express large numbers First let’s look at the blackboard.
(板书)
218 306 5 366
(教师由以前学的百、千引入百万、十亿。)
S1: Two hundred and eighteen.
S2: Three hundred and six.
S3: Five thousand, three hundred and sixty-six.
(教师总结数字的读法，指出易出错的地方并要求学生注意。)
T: Now, look at these numbers. Can you read these numbers
(板书)
736 547 8 736 062 7 198 764 501
(教师先讲解三位一划分原则，再让学生运用。给学生准备时间，然后提问。)
S4: 736 547 seven hundred and thirty-six thousand, five hundred and forty-seven.
(让较好的学生总结数字的读法。教师强调and, -, thousand放的位置，以及注意此处量词不加“s”。)
T: Now, I will ask some other students to read the numbers.
S5: 8 736 062 eight million, seven hundred and thirty-six thousand and sixty-two.
S6: 7 198 764 501 seven billion, one hundred and ninety-eight million, seven hundred and sixty-four thousand, five hundred and one.
T: You are great. Most of you have mastered how to read the numbers. Please look at the numbers in 2a. Read them together.
2. (做游戏，巩固数字的读法。)
T: Let’s play a number game. I will show you some numbers. Read them quickly and correctly in groups.
(每个小组各选派三位学生，由教师统计分数，构建评分机制，激发学生兴趣。)
(板书)
7 398 500 406 000 000 17 602 018 000 676 302 320
(教师在黑板上画出计分表。)
G1 G2 G3 G4
3. T: Look at the pictures of 2b and describe them.
(让学生通过自己的猜测，用所学过的语言知识把图片描述一下。教师可以先提问，复习高位数字的读法并把新旧知识结合起来。)
T: Yeah, very good. Now let’s listen to the tape of 2b and number the pictures you hear and write down your answers. After that, let’s check the answers.
S7: Picture F The jacket costs￥326. 00.
S8: Picture B It’s about 6 575 miles from Beijing to Toronto.
S9: Picture A The mountain is 8 844. 43 meters high.
S10: Picture E The population of China was 1. 3 billion in 2007.
S11: Picture D I think the population of Canada was about 33 million in 2007.
S12: Picture C The dinosaur lived 210 million years ago.
(核对答案。)
Step 5 Project 第五步 综合探究活动(时间:5分钟)
让学生讨论中国现在和将来的人口状况及可能出现的问题，巩固高位数表达法，并根据讨论内容写一篇报告，为下一节课做准备。
1. T: The population problem is the biggest one in China. Now let’s discuss the question: What
are the problems of China’s population
(学生小组讨论。)
T: Who can talk about them
(学生可能要说的很多，但有些语言他们表达不清楚，教师加以引导，使他们尽量用简洁的语言表达清楚。)
S1: The population is still increasing.
S2: The people in the countryside can’t obey the one-child policy.
S3: There are more and more old people in some big cities.
T: Very good. But what do you think of the future of China’s population Please discuss it.
(鼓励学生表达自己的观点。)
S4: The population of China will be about 1.5 billion in 2050.
S5: Maybe China will have a population of about 1.7 billion in 2050.
S6: Maybe the population of China will become smaller than before with the help of the
one-child policy.
(学生可能做出种种猜测。)
2. Homework:
Write a report about the population of China in the future.
板书设计：
China has the largest population.Section Bhave/has a population of It says the world has a population of 6.5 billion.increase by —What’s the population of the U.S.A. the developed/developing country —296 million. So it is.
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