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
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 B have/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. Section C
The main activity is 1a. 本课重点活动是1a。 Ⅰ. Teaching aims and demands 教学目标 1. Learn some new words and phrases:
difficulty, be short of, so far, take measures to do sth., percent 2. Learn some useful sentences:
(1) … and about one fifth of the people in the world live in China.
(2) … our government has taken many measures to control the population.
(3) Thanks to the policy, China is developing quickly and people’s living conditions are
improving rapidly.
3. Talk about the problems the large population causes: (1)It’s difficult for lots of people to find jobs. (2)…, we are short of energy and water.
(3)Most cities are more crowded than before, and the traffic is much heavier. 4. Get students to know how serious the world’s population problem is. Ⅱ. Teaching aids 教具
多媒体/图片/小黑板/录音机 Ⅲ. Five-finger Teaching Plan
Step 1 Review
教师出示一些数字和图表，复习高位数表达法，导入新课。
1. (用添加数字的方法复习高位数字，使学生由浅入深地掌握知识。操作方法：教师首先在黑板上写出一个两位数，然后逐次在前面加上一个数字，被提问的学生由基础较差的向基础较好的依次递进。) T: I’ll write numbers like this “888 888 888, … 8 888 888 888”. Say these numbers as quickly as you can, clear? Ss: Yes. T: 88.
S1: Eighty-eight. T: 888.
S2: Eight hundred and eighty-eight. T: 8 888.
S3: Eight thousand, eight hundred and eighty-eight. …
T: 8 888 888 888.
S4: Eight billion, eight hundred and eighty-eight million, eight hundred and eighty-eight thousand, eight hundred and eighty-eight.
2. (通过多媒体展示世界各国人口图表，复习Section B中重要句型。)
T: You have mastered how to say these numbers. Now look at the chart and review what we’ve learned in Section B. What’s the population of the world? Ss: It is said that the world has a population of 6.5 billion. T: Which country has the largest population?
Ss: China has the largest population, with 1.3 billion. T: Is the world’s population increasing now?
Ss: Yes, the world’s population is increasing by 80 million every year. T: It is really one of the greatest problems today. I think we should do something to solve this problem. Ss: Yes.
Step 2 Presentation
通过图片，创设语言情景，呈现部分生词、词组及分数的表达法。 1. (教师展示人才市场的图片和事先准备好的小黑板，引出1a。)
T: Just now, we have known the world has a large population. Now, look at the picture and the statements about population: （出示小黑板。） (1) Every minute about 261 babies are born in the world. (2) The world’s population is growing faster and faster. (3) China has the largest population in the world. (4) China’s population has reached one fifth of the world’s population. T: What do you think of the picture and the statements, boys and girls? Ss: That’s terrible!
T: Yes. The growing population will cause many difficulties. It will influence the development of the world’s economy. So far, some families still can’t offer their children a good education.
(板书单词difficulty，词组so far，要求学生掌握。) difficult(adj.)—difficulty(n.)—difficulties(n.pl.) so far T: Do you want to know other problems caused by the large population? Ss: Sure.
T: We are short of energy and water. Now China’s population is one fifth of the world’s population. It means it is 20 percent of the world’s population, so China has taken some measures to solve the problem. Do you know what they are? (板书one fifth，详解并要求学生掌握分数表示法；掌握单词percent，词组be short of, take measures to do sth.。) be short of one fifth percent take measures to do sth. Ss: One is known as the one-child policy. It has worked well in controlling China’s population.
T: Thanks to the policy, China is developing quickly and people’s living conditions are
improving rapidly.
(让学生读1a，然后回答1a中的两个问题，完成1a。)
Step 3 Consolidation
利用关键词复述1a，并独立完成1b，进一步了解中国所面临的人口问题。 1. (让学生自读1a并独立完成1b，然后核对答案。)
T: Let’s look at 1b. Describe the disadvantages of China’s large population according to 1a and
write them down. You have two minutes. (两分钟后，教师核对答案。)
T: Now I will ask several students to write their answers on the blackboard. S1: Less space to live in.
S2: Difficult to find jobs for lots of people. S3: Short of energy and water. S4: Most cities are more crowded. S5: The traffic is heavier.
S6: There will be much more pollution. S7: …
T: Your answers are wonderful.
2. (学生阅读1a的同时, 教师把关键词列在小黑板上。)
T: Boys and girls, please read 1a again and then retell it according to the key words on the small blackboard.
(教师出示小黑板。) 6. 5 million 3 billion half one fifth cause difficulties take measures to work well in living conditions serious a long way (首先，教师根据小黑板上的关键词复述1a作示范，然后让两位同学复述。当学生表达错误时, 教师给予纠正。当学生表达不出时, 教师或其他同学给予帮助，提高学生口语复述能力。)
Step 4 Practice
播放2a录音，完成2b。进一步了解世界和中国人口状况，强化练习现在完成时的用法。 1. (教师拿出一张”地球上站满人”的图片或将图片展示在多媒体上。让学生仔细观察, 然后播放2a录音。)
T: Now, look at the picture. The earth is full of people. Every minute about 261 babies are born in the world. That means people have to find food for about 375 840 newborn babies every day. The population problem is serious. Please listen to the tape and complete the article in 2a.
(板书并要求学生了解。)
newborn T: Now, look at the text by yourselves. Let’s listen to the tape again and check the answers. (让学生核对完后, 一起齐读短文。)
T: You have understood the text. Let’s do the exercise in 2b. Then we will check the answers. (给学生一分钟, 理解2b中的五个句子, 让一位学生回答。)
