初三英语下学期lesson50[最新]

Lesson 50,The Worlds Population,Standing Room Only,Hardly room for anyoneOnly enough room to stand,The diagram of the increase of the population in the past 2000 years,What can we learn from this diagram,What is 372,960 multiplied by 365 ? It is_.,The newly-born babies in a year,136,130,400,How many more mouths do people have to feed in one year?,What can we learn from this diagram?,资 源 的 短 缺,The lack of the resources,Forest,Coal,Water and land,Oil,Poverty （贫穷）,Hunger,Pollution,Limited living room and the housing in bad condition,More unemployment and morechallenge(就业困难竞争激烈）,Crowded,What shall we do?,Chinas Family Plan,Chinas has slowed down the increase of the population.,One-child Family Policy,July 11,World Population Day,Discussion,China has the largest population in the world.,Do you think its good or bad?Why do you think so?,1. Chinas population growth rate has slowed in the past five years, although its population is still increasing .,Population Trend in China,2. Family planning in China started in the early 1970s. It enjoys the understanding and support of the population and has got good results.,Population Trend in China,3. China would have 260 million more than the present population if the family planning program had not been used. As a result, life is much happier. The family planning policy is unshakeable.,Population Trend in China,New babies birth rate,259,15,540,370,000,135,050,000,Multiply by,The increasing population all over the world,The worlds population,5.In 1970, the _was more than 3.6 billion.6. In 1990, it reached over 5 _.7.At the start of the 21st century, it _six billion.8. _the year of 2010, it may be _.9.There _be _ room only on the earth in 600 years.,The Increasing of Population,1.The greatest _ may be the _today.2. 2000 years ago , there were only_ people on the earth.3.Four hundred years ago, the _ was over 500 million.4._ of 20th century, the worlds population was about _billion.,The Increasing of Population,Read the passage on page 62 and answer the questions :How many babies are born in one hour ?2. How many new babies do people have to feed in one day ?3. What do you think is the greatest challenge of the world today ?4. How is the worlds population growing ?,Over 15,540.,Over 370,000.,The increasing population .,Its growing faster and faster .,5. When was the population over 6 billion ?6. How big will the worlds population be by the year 2010 ?7. What will happen in about 600 years ?8. What do you think we should do to slow down the growth of the worlds population ?,At the beginning of the 21st.,Seven billion .,There will be standing room only on the earth .,We have to carry out the one child policy .,1. What is the greatest challenge of the world today ? 2. How is the worlds population growing ?3. How big will the worlds population be by the year 2010 ?,The increasing population.,Faster and faster .,It may be seven billion .,250 million,400 years ago,At the beginning of the 20th century,3.6 billion,5 billion,At the beginning of the 21st century,7 billion,Standing room only,Key points :Whats the population of China ? = How large/big is the population of China ? = Whats the number of people in China ? = How many people are there in China ?中国人口比美国人口多得多。The population of China is much larger than that of the USA . 表示人口”多”要用large或great修饰， 表示人口”少”用small来修饰。中国约有13亿人口。 The population of China is about 1.3 billion . = China has a population of about 1.3 billion .,1,Key points :What can be done to slow down the population increase ?(带情态动词的被动语态）= What can we do to slow down the population increase?(主动语态） Something must be done to protect our environment. =We must do something to protect our environment2. Standing Room Only .a) room 地方、空间（=space) Please make room for me . Leave a space for me . There will be hardly enough space for anybody else . b)space 多指“空间、太空” I hope that I can travel in space.hour after hour year after year 年复一年 day after day 日复一日 time after time再三， 。,4. ., the population of the world increased by 259 by 表示增长的程度. “达到” The number of the students in our school has increased by over 500 since last year.multiply by 将 乘以 Multiply 5 by 4 and the answer is 20. multiply by 乘以 3 multiplied by 2 is 6 . 3 乘以2等于6 。 Multiply this by 365 . 把这个（数字）乘以365,1.If you multiply 5 by 3, you get 15.2. X multiplied by 10 is 10X.3. In warm weather these germs multiply rapidly.,Word study,5. at the beginning of 在-开始时， 起初 At the beginning of the class, the classroom is very noisy. Youll find the word at the beginning of that sentence6. The worlds population has passed six billion . = The worlds population is over six billion .7. challenge n. & v. 挑战e.g. I challenged him to a game of tennis . I challenged him to swim across the river . The Red Team will meet the challenge of the Blue Team.,8. the population of the world = the world( )s population the population of the more developed countries 发达国家的人口the population of the less developed countries 发展中国家的人口China is a developing country .中国是个发展中国家Practise this dialogue like this (Lesson 50 Part 3) :- Whats the population of the more developed countries in 1990 ?- 1,214,000,000,hour after hour 一小时接一小时 multiply.by : times e.g. multiply 2 by 3 more : another,1. fast and faster better and better2. beginning at the beginning of 3. square 平方 one square meter three square meters4. hardly : almost not e.g. He has hardly eaten anything .,A comparison,832 million,1 billion,214million,1 billion,188 million,1 billion,693 million,4 billion,107 million,4 billion,867 million,A comparison,1950,1990,2000,2,billion,1,3,4,The population of developed countries is _now,While the population of developing countries is still _, but more slowly.,Summary,decreasing,increasing,Why is this?,1.the developed economy live a happier and easier life understand the population problem,Probe,Effect: the aging population stop the development,2.the big basis of population poor health , medicare system poor understanding of,Talk about in groups,1 .Do you think the worlds population is too big ?2. What can be done to slow down the population increase?,Feed back Exercises:,A. Choose the best answer.1. China is getting . A. stronger and stronger B. strong and strong C. more and more stronger D. more and more strong,A,Feed back Exercises:,2. The 20