高一下学期英语人教必修三Unit4reading课件

Reading HOW LIFE BEGAN ON THE EARTH A Quiz Game 1. How old is the earth? A. About 3.5 billion years B. About 4.5 billion years C. About 5.5 billion years D. About 6.5 billion years 2. ______ of the earth surface is covered by water. A. 20% B. 30% C. 50% D. 70% 3. How many planets are there in the Solar System? A. 6 B. 7 C. 8 D. 9 4. What is the total population of humans on the earth? A. About 3.5 billion B. About 4.5 billion C. About 5.5 billion D. About 6.5 billion 5. How long does the rotation (自转) of the earth take? A. 12 hours B. 24 hours C. a month D. 365 days 6. Which continent is the smallest? A. Africa B. North America C. South America D. Oceania 7. On what day is the Earth day celebrated? A. April 22 B. May 4 C. August 21 D. November 11 8. Which ocean is the largest? A. The Pacific Ocean B. The Arctic Ocean C. The Indian Ocean D. The Atlantic Ocean 9. Which country has the largest area? A. Canada B. China C. Russia D. U.S.A 1.What’s the meaning of the word “Astronomy”? I. Warming up the science of stars; the scientific study of stars and planets. 2. What words will you think of when we talk about this topic? star, planet, the sun / moon / earth, solar system 恒星 行星 太阳 月球 地球 太阳系 3. How many planets are in the solar system? The Solar System 1111 5. The names of eight planets. • Mercury • Venus • Earth • Mars • Jupiter • Saturn • Uranus • Neptune 1) 水星 2) 金星 3) 地球 4) 火星 5) 木星 6) 土星 7) 天王星 8) 海王星 商业之神”和“旅行之 神”爱与美之神 该亚 战神 天神 农业之神 宇宙之神 海神 Mercur y Venus Earth Mars Jupiter Uranus Saturn Neptune 6. Put them in correct order on P25. Do you know their origin? II. Pre-reading 1.Have you ever asked your mother, “Mom, where do I come from”? 2. Nearly everybody has this or that puzzles: How do human beings come into being? How does the earth come into being? 3. In China, there are two legends about these puzzles. Do you know the names? 盘古开天辟地 女娲补天造人 4. In the western culture, who creates everything in the world? Each religion and culture has its own ideas about how life began on earth. What do you know? In China, we all know that Pangu separates the sky from the earth and Nvwa made humans. Other legends about the beginning of universe. The Biblical Account Day 1: God spoke and separated light from darkness creating Day and Night. Day 2: God spoke and separated the water creating sky and ocean. Day 3: God spoke and created dry land. Day 4: God spoke and created the sun, moon and stars. Day 5: God spoke and created living creatures in the air and sea. Day 6: God spoke and created the land animals and man. Day 7: God rested and blessed this day calling it Holy. India Brahma(梵天、四面 佛) is the god first represented in the Hindu Triad（初禅）. He is the creator of the universe and all living beings are said to have evolved from him. How life began on the earth in science field III. Fast-reading 1.Do you believe in such stories? Are they based on science? 2. In this unit, we’ll learn something more scientific. 3. What’s the title of the text? 4. From the title, we can predict that the text may tell us the origin of life on the earth. skimming How does the author develop the passage? A. Give examples（举例） B. In time order（以时间顺序） C. Comparison（比较） What’s the writing style of the text? A. Narrative 记叙文 B. Explanation 说明文 C. Essay 散文 Para. 1 The formation (形成) of the earth. Para. 2 The importance of water for life. Para. 3 A widely accepted theory about the formation of the universe. Para. 4 The arrival of humans and their impact on the earth. Para. 5 The development of plants and animals on the earth. Second reading How life began on the earth “Big Bang” other bodies________ stars Earth: a cloud of _____ atoms dust Summary a solid _____ the earth’s _____________ other 4. _____ Water: ____________ to the development of life water vapour nitrogen carbon extremely small _______ on the surface of the water globe gases atmosphere fundamental plants early _________ and all sorts of fish green plants on land land animals insectsamphibians ___________ huge animals (dinosaurs) the rise of __________ human beings shellfish reptiles mammals T/ F 1. The earth appeared before the Big Bang happened. 2. The original atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Life began in water and then on land. 5. Mammals appeared before the development of dinosaurs. 6. Dinosaurs could give birth to young baby animals and produced milk to feed them. 7. Human beings produce too much carbon dioxide which causes the global warming on the earth. 8. According to the text, human beings would disappear in the end. F F T T scanning F F T F Answer the following questions. 1. Why was the earth different from other planets? The water remained. 2. Why did the plants grow before the animals came? Because plants provide oxygen for animals to breathe. 3. Why is it wrong in films and stories to show dinosaurs and people together? Because dinosaurs died out long before human beings developed on the earth. Comprehending 4. There used to be nine planets in the solar system. Recently scientists have decided that one of them can no longer be considered a planet. Do you know the name of that planet? Do you know why they removed it? Pluto. Scientists now think it is too small to be called a planet. 5. What problem is caused by human beings? They cause global warming. • （ ）1 Insects and amphibians appeared. • （ ）2 Dinosaurs appeared. • （ ）3 The earth became a solid ball. • （ ）4 Small plants grew on the water. • （ ）5 Reptiles appeared. • （ ）6 Plants began to grow on dry land. • （ ）7 The earth was a cloud of dust. • （ ）8 Water appeared on the earth. • （ ）9 Shellfish and other fish appeared. • （ ）10 The universe began with a “Big Bang”. • （ ）11 Clever animals with hands and feet appeared. • （ ）12 Mammals apeared. 5 10 6 2 9 4 8 3 7 1 Put the order of development of life into a time line. 12 11 Summary Greenhouse effect The earth is our only one home.Are we taking good care of the earth? What problems are humans causing ? putting too much carbon dioxide into the air the earth may become too hot No life will be on the earth As a student, what can we do for the earth? solar energy plant trees recycle rubbish prevent desertification save water purify air We have only one earth! We should take care of the earth! Only if we care shall we help！ Only if we help will all be saved!