Unit 7 Lesson 38The world is a big place 课件 2022-2023学年冀教版八年级英语下册

Unit7 Know our world Lesson 38 The world is a big place By Anne 1 What do you know about the earth? land ocean a planet One third of the planet is land. 1/3 Oceans cover two thirds of the earth’s surface. 2/3 By Anne What problem does the earth face? Para 1 By Anne What problem does the earth face? The population of the world is increasing very quickly. reach 9 billion 8 billion over 7 billion in total a total of 总共，总计 totally adv. 完全=completely decrease v. billions of 数十亿的 有数字：没有S, 没有of 没有数字：有S, 有of 2025 2010 What’s the world’s population in 2010? What’s the world’s population by 2025? What’s the world’s population by 2050? Para 1 By Anne What is another problem? land ocean One third of the planet is land. these dry places are called dessert some areas have very high mountains It’s difficult to live in these places. 被动语态：be+done drier----driest Para 2 By Anne How many continents in the world? What are they? 6 1 North America 5 4 3 2 South America Europe Africa Asia Australia 7 Antarctica By Anne •Asia is the largest continent. •Africa is the second largest one. ...... Asia Africa North America South America Antarctica Europe Australia There is few people in Antarctica. By Anne Why? Antarctica is covered with snow and ice all year round. 被动语态：be+done The snow and ice cover Antarctica. Para 3 By Anne land ocean Oceans cover two thirds of the earth’s surface. The Pacific the Arctic Ocean the Indian Ocean The Atlantic Ocean 分数表达法：分子基数词 分母序数词 分子＞1，分母+S a half 1/2 a quarter 1/4 three quarters 3/4 Which is the largest one? India n. 印度 Para 4 Two thirds of the students go abroad. One third of the water is dirty. By Anne The earth is our home. We must treat it well for our children. The earth must be treated well for our children. 被动语态：be+done By Anne summary in total one third two thirds be covered with by 2025 rich lands billions of 总共，总计 三分之一 三分之二 被....覆盖 在2025年之前 肥沃的土地 数十亿的 By Anne 1. It is snowing all