Unit 1 Topic 2 Section B课件2025-2026学年仁爱科普版（2012）英语九年级上册

该初中英语课件围绕“人口问题”主题，系统覆盖数字英文读法（百、千、百万、十亿及小数点）、人口相关词汇（population, billion等）及语法点（population修饰、increase by/to、So结构），课堂从基础数字读写入手，通过示例进阶到复杂数字，再结合各国人口数据构建从语言知识到主题应用的学习支架。 其亮点是以数字读写为基础，设计阶梯式练习与人口讨论活动，通过发展中国家与发达国家人口对比培养思维品质，语法点配实例与练习提升语言能力，总结与作业帮助学生巩固，教师可高效开展语言教学与主题探究，助力学生提升语言应用与问题分析能力。

Section B Unit 1 The Changing World Topic 2 The population in developing countries is growing faster. 1,000,000,000 one billion 1,000,000 one million 1,000 one thousand 3.14 three point one four 100 one hundred 小数点读point Presentation: 朗读时，将每三位数看做一个单位，从右往左依次为thousand千，million百万，billion十亿。每个单位按照百、十、个位向下读，其中百位到十位之间要加入 and。 101 110 122 143 1,000 10,000 1,000,000 100,000,000 1,000,000,000 one hundred and one one hundred and ten one hundred and twenty-two one hundred and forty-three one thousand（千） ten thousand （一万） one million(百万） a /one hundred million（一亿） one billion(十亿） A thousand million. 百位到十位之间要加入 and。 Presentation: 973 nine hundred and seventy-three 3 980 three thousand , nine hundred and eighty 98 721 ninety-eight thousand , seven hundred and twenty-one 768 540 seven hundred and sixty-eight thousand , five hundred and forty 1 , 0 0 0 , 0 0 0 , 0 0 0 billion million thousand 1 , 0 0 0 , 0 0 0 , 0 0 0 billion million thousand 543.7 five hundred and forty-three point seven 1 562 one thousand, five hundred and sixty-two 6 004 001 six million, four thousand and one 7 198 764 502 seven billion, one hundred and ninety-eight million, seven hundred and sixty-four thousand, five hundred and two 2 346 780 two million, three hundred and forty-six thousand, seven hundred and eighty 82 346 580 eighty-two million, three hundred and forty-six thousand, five hundred and eighty 405 000 000 four hundred and five million 5 555 555 555 five billion, five hundred and fifty-five million, five hundred and fifty-five thousand, five hundred and fifty-five 1 , 0 0 0 , 0 0 0 , 0 0 0 billon million thousand billion 十亿 e.g. 1.3 billion 十三亿 billion与million, thousand, hundred一样，在表示确切数字时，不能使用复数形式，但是，不表示确切数字时，如成百、成千、上万时，要以复数形式出现，且要与of连用，构成短语。 e.g. hundreds of 数百，成百上千的 thousands of 成千上万的 millions of 数百万 billions of 数十亿 1b Listen to 1a and match the information. 1. the world 2. China 3. India 4. the USA A. 321 million B.7.2 billion C. 1.37 billion D. 1.31 billion 8 Make similar conversations after the example. Example: A.: What’s the population of the world? B: It’s about 7.2 billion. 1. the world 2. China 3. India 4. the USA A. 321 million B. 7.2 billion C. 1.37 billion D. 1.31 billion 9 1c Read 1a and fill in the blanks. The world has a population of 7.2 billion and it is increasing by __________ every year. _______ has the largest population. It has already reached __________ and India is _________ with 1.31 billion. The population in developing countries is ______ and is growing ________ than that in developed countries. Luckily, our country has carried out some policies to ______the population. 90 million China 1.37 billion second larger faster solve Grammar: Language points: 1. What a large population! population意为“人口”,“居民”，常用形容词large或small来表示人口的多少。 e.g. China has the largest population in the world. 中国拥有世界上最多的人口。 注: 常用句式：What’s the population of...? 意为“……人口是多少？” have a pupulation of... 意为“有……人口” e.g. China has a population of 1.3billion. 中国有13亿人口。 e.g. The population of this city is nearly 300 000. 这个城市的人口将近三十万。 e.g. 80% of the population in China are farmers. 中国百分之八十的人口是农民。 e.g. The population of China is very large. 中国人口众多。 The population in this area is becoming smaller and smaller. 这个地区的人口越来越少。 强调人口的具体分布或构成 (作复数） BACK population 集合名词 某地整体人口的数量(作单数） 通常用large/ big/ small 来修饰。 Grammar: Language points: 2. And it is increasing by 80 million every year. increase v. (使)增加，（使)增大，增多。 increase by＋倍数或百分数，表示“增加了……倍或百分之……”。 e.g. Compared with last year, our pay has increased by three times. 与去年相比，我们的工资增长了3倍。 increase to＋具体的增长后的数字，表示“增加到了……”。 e.g. Our rice output has increased to 6 million tons this year. 我们的水稻产量今年增长到了600万吨。 The supermarket is very crowded. So it is. So +主语+ be/情态动词/助动词,A如此，A的确如此，表示赞同。 Lucy dances very well. She has cleaned the room. So she does. So she has. So it is. Language points 确实如此。 Grammar: Language points: 3. So it is. 该结构主要用于加强语气，其意为“的确如此、确实如此” ，表示后者赞同前者的话或意见，只是进一步强调并重复前句所述的内容。前后句的主语指的是同一个人或物。该结构中的助动词 do 根据前文的情况也可换成 is, am, are, was, were, does, did, can, could 等。如: -He has done a good job. 他干得不错。 -So he has. 他的确干得不错 Grammar: Language points: carry out 实行，进行，执行。 e.g. It won’t be an easy plan to carry out. 那并不是一个容易实施的计划。 e.g. This is a new policy, and they will carry it out next year. 这是一项新政策，他们将在明年实施它。 4. Luckily, China has already carried out the one-child policy to control the population. 6800 80 80 80 The population is increasing by 90 million every year. = The world has a population of 7.2 billion. What a large population! developing countries developed countries The population of the world : 6.8 billion. The population in developing countries is larger than that in developed countries. 发展中国家 发达国家 形容人口多用large/big修饰，形容人口少用small 修饰 China has the largest population. 3 Work in groups and discuss the population of the world. The following chart and questions may help you. 1. Which of these 5 countries has the largest/smallest population? What’s the population of it? 2. What can you tell from the population in developing countries and in developed countries? 3. What problems does the large population cause? 4. What measures do you think should be taken to solve the population problem? China has the largest population. The population of China is 1.37 billion. Canada has the smallest population. The population of Canada is 35 million. The population in developing countries is larger than that in developed countries. The large population may cause less living space, more pollution and so on. Grammar: Language points: 1、a report on population in the newspaper 2、发展中国家 3、发达国家 4、What’s more 5、So it is 6、carry out 7、one-child policy 8、control the population 报纸上关于人口的报道 developing countries developed countries 而且，还有，更有甚者 确实如此 执行，采取 独生子女政策 控制人口 Choose the best answer. 1. — ______ is the population of Russia? — 143 million. A. How much B. How many C. What D. How 2. There are ______ students in our school. A. three thousands B. three thousands of C. three thousand of D. three thousand 3. — Jenny always helps others. — ______. A. So is she B. So she is C. So does she D. So she does 4. The population of China is ______ than that of Japan. A. larger B. more C. fewer D. less C D D A Exercises summary We learn: 1. Read numbers in English. 2. Talk about population problems. We can: 1. Some words: population, billion, increase, reach, luckily, policy, Russia, measure 2. Some phrases: increase by, developing countries, developed countries, carry out, the one-child policy 3. Some sentences: What a large population! The world has a population of 7.2 billion. So it is. Homework 2. Read the numbers in Part 2 on P12. 1. Read 1a aloud. 3. Finish Section B in your workbook. 4. Preview Section C. Thank you. $