3. Review some useful sentences.

2. Review the present perfect tense:

　 (1) have/has been to…

　 (2) have/has gone to…

　 (3) the use of “just”, “yet”, “already”, “ever” and “never”

1. Master some new words and useful expressions:

less than, unless, couple, a couple of, market, excellent, keep up with, relation

2. Homework:

Make a survey and complete the chart, then write a survey report. You can search the information on the Internet.

板书设计：

1. T: You have known so much about the population. Now, turn to Page 14 and write a letter to your pen pal about the population problem in China. The questions in 3 may help you, then I will ask some students to show their opinions.

　 (学生们互相交流想法。)

　 (让学生写一封信给他/她的笔友, 谈谈他/她对中国人口问题的看法, 可以借鉴3中五个问题的说法。写的好的，可以读一小段给同学听。教师说明写信时必须注意的事项。)

2. (如果有时间, 让学生完成一个复述性的填空。)

T:　　　 Please look at the small blackboard. Finish them according to 1a.

(教师出示准备好的小黑板, 让学生把答案写在课堂作业纸上。)

　 In 2007, the world’s population was about 　　　　　　　　. More than _______ _______

people live in Asia now. China has the largest population in the world, and about _____ _____

of the people in the world live in China. A large population 　　　　many difficulties. China has done something to 　　　　the population. 　　　　　　　　the policy, China is developing quickly and people’s living conditions are improving rapidly.

T:　　　 Let’s check your answers together.

(在短文中呈现正确答案, 并让同学们一起朗读。附答案为：6.6 billion, three billion, one fifth, causes, control, Thanks to。)

Step 5　 Project 第五步 　综合探究活动(时间:5分钟)

1. T: Now, look at the picture. The earth is full of people. The population problem is serious. Please listen to the tape and complete the article in 2a.

　 (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, 然后播放录音2a。)

　 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, 一起齐读这篇短文。)

　 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中的四个句子, 让一位学生回答。)

2. T: Let’s look at 1b (work alone). Describe the disadvantages of China’s large population according to 1a and write them down. You have two minutes.

　 (给学生两分钟完成, 然后让几位学生写到黑板上。)

T: Now I will ask several students to write their answers on the blackboard.

　 S₁:Smaller places 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.

Step 4 　Practice 第四步 　练习(时间:8分钟)

4. China’s population has reached one fifth of the world’s population.

What do you think of the picture and the materials, 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 can’t offer their children a good education.

(板书单词difficulty, offer，词组so far，要求学生掌握。)

T:　 Do you want to know other problems caused by the large population?

Ss: Sure. We are short of energy and water.(教师帮助学生回答)

(板书。要求学生掌握词组be short of。)

T:　 Yes, 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，理解词组take measures to。)

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.

(让学生认识到be known as, thanks to的用法。)

(让学生读1a，然后回答1a中的两个问题。)

Step 3　 Consolidation 第三步 　巩固(时间:10分钟)