(
课件网) Lesson 38 The World ls a Big Place Unit 7 Know Our World Talk About How many continents are there in the worid What are they What do you know about the place where you live [ k nt n nt] n. 洲；陆地 New Words planet billion total increase surface Indian Atlantic Arctic [ pl n t] n. 行星 [ b l n] n. 十亿；千兆 [ t tl] n. 总计；总数 adj.总的；总计的 [ n kri s ] v. 增加；增大 [ s f s] n. 表面；表层 [ ndi n] n. 印度人 adj.印度的 [ t l nt k] n. & adj.大西洋（的） [ ɑ kt k] adj.北极的 百：hundred 千：thousand 百万：million India n.印度 读课文，回答问题 What problems does the earth face Which continent can’t people live on Why How many oceans does the world have 读课文，回答问题 What problems does the earth face Which continent can’t people live on Why How many oceans does the world have The world's population is increasing very quickly. People can't live everywhere on the earth. Antarctica. Because it is covered with snow and ice all year round. Only one How many continents and oceans does the world have Can you point thcm out The earth is a very special planet, and it faces a big problem. In the year 2010，the world's population was over 7 billion in total. It is increasing very quickly.By 2025, the world may have about 8 billion people. And by 2050, the world's population may reach 9 billion. There is another problem. People can't live everywhere on the earth. We can't live in water, and only about one third of our planet is land. But parts of this land are very dry. These dry places are called deserts. Some areas have very high mountains. Others have a lot of snow and ice. It is not easy to live in those places. There are seven continents: Asia, Africa, Australia,Antarctica, Europe, North America and South America. Antarctica is covered with snow and ice all year round. Luckily, people can live on the other six continents. On these continents, there are green forests, fresh water and rich lands. Oceans cover two thirds of the earth's surface. The earth has only one big ocean but we use these names for its different parts: the Pacific Ocean, the Indian Ocean,the Atlantic Ocean and the Arctic Ocean. The Pacific Ocean is the largest one.The earth is our home now, and it will be our home in the future. It must be treated well for our children and for our children's children, too! Phrases 面临一个大问题 总计 三分之一 被...覆盖 三分之二 用...代表... face a big problem in total one third be covered with two thirds use...for in all 知识点讲解 1. It is increasing very quickly. increase v. 增加；增大 反义词： decrease v. 减少；降低 ① increase by+ 增加的量 例如：如果某物的价格从100元增加到110元, 可以说“The price has increased by 10 yuan.” ② increase to+ 最终值 例如，如果一个城市的人口从100万增加到120万， 可以说“The population has increased to 12 million.” 2. We can't live in water, and only about one third of our planet is land. 分数表达： ① 当分子为1时，可以使用"one"或"a"。 例如，五分之 ... ...
