人教版必修4 Unit2 Working the land Warming up 课件.ppt

Unit 2 Working the land Warming up The only way to solve the food shortage problem is to increase the yield of the grain crop per land area through the advancement of science and technology. 杂交棉 杂交梨 重穗型超高产杂交稻 杂交甜椒 杂交茄子 杂交玉米 * * Enjoy a Poem By Li Shen Farmers weeding at noon, Sweat down the field soon. Who knows food on a tray, Due to their toiling day. weeding 除草Sweat汗 tray 盘 toiling辛苦，劳累 What do you know about “farming”? wheat rice corn potatoes peanut tomatoes broomcorn cotton Agriculture in the past Agriculture in the modern times Have you ever been to the countryside? What did you see or do there? 1 Are you from a farmer’s family? What do you know about farming? ploughing(犁田) 2 seeding (播种) fertilizing (施肥) irrigating(灌溉) harvesting (收获) winnowing (扬谷) grow some young plants insert the young plants into the field insert插入，嵌入 Have you ever grown any plants? If so, what did you do to grow them? If not, what kind of plant would you like to try growing? How would you grow it? 3 rice Read the statistics below. Did you know these facts before? What problem do they show? Pre-reading 1 What is the main food in all East Asian and Southeast Asian countries? Rice. It is said that there are 2.4 billion people to eat rice every day throughout the world. If that happened, people might die of hunger. The whole world would get into trouble. What do you think would happen if tomorrow there was suddenly no rice to eat? Hunger n. 饥饿, 饥渴; 渴望 vi. 渴望; 渴求 Do something to help end hunger in the world!!! In the late 1990s, Brown, an American scholar, came up with the theory of Chinese Menace(威胁), which said that in the 2030s, Chinese population will add up to 1.6 billion, and had the question who would feed the large population in China as well as in the world. Just at that time, a Chinese scientist declared to the world that China can solve the problem by himself and help to solve the same problem in the world. Yuan Longping “Father of Hybrid Rice” 辣椒 *