2020新教材：外研版必修一英语unit5P2 Understanding ideas ppt课件（含视频+音频）.ppt

1、Words and Expressions monarch monarch butterfly Atlantic whale annual migration migrate seek n. 君主，国王君主，国王 黑脉金斑蝶黑脉金斑蝶 adj. 大西洋的大西洋的 n. 鲸鲸 adj. 一年一度的，每年的一年一度的，每年的 n. 迁徙迁徙 v. 移栖，迁徙移栖，迁徙 v. 寻找，寻求寻找，寻求 Read after the tape and speak out the Chinese immediately. Words and Expressions professor measure pos

2、ition determine eventually solution mystery amazing n. 教授教授 v. 量，测量量，测量 n. 位置位置 v. 测定，确定测定，确定 adv. 终于，最终终于，最终 n. 解决，解决方法解决，解决方法 n. 难以理解的事物，谜难以理解的事物，谜 adj. 惊人的，了不起的惊人的，了不起的 Words and Expressions crash per cent destroy chemical caterpillar creature survive effect flow chart v. 暴跌暴跌 n. 百分比百分比 v. 破坏，毁掉破

3、坏，毁掉 n. 化学品化学品 n. 毛虫（蝴蝶等昆虫的幼虫）毛虫（蝴蝶等昆虫的幼虫） n. 生物，动物生物，动物 v. 活下来，幸存活下来，幸存 n. 影响，结果影响，结果 流程图，作业图流程图，作业图 Before reading Watch and sayWatch and say 1. What phenomenon is mentioned in the video? 2. What is “animal migration” ? Animal migration Animal migration refers to the movement of a species from one

4、 habitat to another in response to seasonal changes to the environment. Migration happens in all parts of the animal kingdom, from fish and insects to birds, reptitles and mammals. Look at the pictures and choose the animals that migrate. Share your answers! Now talk about what you know about animal

5、 migration based on these points Animal that migration Time of animal migration Influences of human activities on animal migration Reasons for animal migration Now lets read a passage about the Monarchs journey. While reading Read and finish the tasks as quickly as possible. What is the main idea of

6、 the passage? A. The monarchs migration. B. The reasons for monarchs migration. C. Mexicos monarch. Task 1 Go through the passage quickly and answer the questions. Tips The main idea of a passage can be found from its title, the topic sentence, or even the pictures. Tips Title The topic sentence Pic

7、tures Read the passage and find out what mystery the scientists have solved. Task 2 The scientists have solved the mystery of how monarch butterflies manage to travel a long distance and find their way to their destination. 2 P50 1. In a scientific research paper about the monarch butterflys migrati

8、on. 2. In a popular nature magazine introducing the monarch butterfly. 3. In a travel leaflet encouraging people to visit North America. Choose where you are most likely to find the passage. Task 3 3 P52 1. Why do many animals migrate? (Para. 1) 2. How does the monarch determine the way to go? (Para

9、. 3) 3. What has happened to the monarch in the past few years and how did it happen? (Para. 4) 4. Whats the significance of the research on the monarch? (Para. 5) Read paragraph by paragraph to answer the following questions. Task 4 1. They migrate to find food, seek a partner, or in search of warm

10、er weather. 2. The monarch is able to tell the time of the day and the point where the sun is in the sky. 3. Because of human activities the number of the monarch has crashed by as much as 90 percent in the past few years. 4. The research on the monarchs behavior has led to a greater awareness of it

11、 and people have been working together to record its migration and make sure there are enough plants for it to feed on. Complete the sentences with expressions from the passage. Then use sentences to complete the “cause-effect” flow chart. Task 5 4 P52 d a. The monarch butterfly is able to tell _. b

12、. Using these two pieces of information, the monarch butterfly determines _. c. The monarch butterfly measures _ _ with its eyes. d. The monarch butterfly reaches _ _. the time of day the way to go the position it will spend the winter a / c c / a b of the sun the places where Check your answers! h

13、e. Humans _ trees. f. The _ where monarchs can be found is destroyed. g. Humans use chemicals that _ that monarch caterpillars eat. h. The monarch butterflys population _ _ in the last few years. cut down natural environment of many places kill the plants (by as much as 90 per cent) e / g g / e f ha

14、s crashed After reading analyzing, mindmap, summary, retelling The monarchs journey The definition of migration The background to the monarchs migration The mystery of the monarchs migration The trouble of the monarch Its solution Learn to understand the passage. 1 Influences of human activities on

15、the monarch 1. These two pieces of information- the time of day and the point where the sun is in the sky- allow the butterfly to dertermine the way to go. 插入语 定语从句修饰先行词the point 关系 副词 Paraphrase The butterfly is aware of the time of the day and the position of the sun in the sky, so it can use thes

16、e two pieces of information to find out which way to go. 这两条信息这两条信息一天中的时刻和太阳在天一天中的时刻和太阳在天 空中的位置空中的位置让黑脉金斑蝶能够判定前让黑脉金斑蝶能够判定前 进方向，最终成功抵达过冬的地点。进方向，最终成功抵达过冬的地点。 Sentence analyzing for better understanding 2 2. The solution to the mystery of the monarchs amazing ability comes at a time when it is in serio

17、us trouble. 时间状语 从句 solution to sth 的解决办法的解决办法 Theres no simple solution to this problem. 这个问题没有简单这个问题没有简单的解决办法的解决办法。 She came up with an ingenious solution to the problem. 她想出一个特殊她想出一个特殊的办法的办法来解决这个问题。来解决这个问题。 in serious trouble Without your help, we would have been in serious trouble. 没有你的帮助，我们会没有你

18、的帮助，我们会遇到大麻烦遇到大麻烦。 You will be in serious trouble if anyone finds out the truth. 如果有人发现真相，你的如果有人发现真相，你的麻烦就大了麻烦就大了。 遇到大麻烦遇到大麻烦 Paraphrase People solved the mystery of the monarchs amazing ability at the same time that the monarch is facing a serious and difficult situation. 黑脉金斑蝶这一惊人能力的奥秘被揭开时，黑脉金斑蝶这一

19、惊人能力的奥秘被揭开时， 这一生物正处于水深火热的生存状态中。这一生物正处于水深火热的生存状态中。 翻译句子。翻译句子。 1. 人们喜欢住在空气新鲜，噪声少的地人们喜欢住在空气新鲜，噪声少的地 方。方。 People like to live in a place where there is fresh air and little noise. 2. Who do you call on when youre in serious trouble or facing a crisis? 当你当你遇到麻烦遇到麻烦或面对危机时，你可以向或面对危机时，你可以向 谁求救呢？谁求救呢？ The Mo

20、narch s Journey Where Time How Every _ Travel around 4000 km south to _or _ Use _ to measure_ _and _ _ Main causes: _ such as _ and _ cutting down trees using chemicals Solution: Make sure that there are _for it to feed on enough plants autumn California Mexico time of the day eyes where the sun is

21、in the sky human activity Trouble:_ _ _ its population has crashed by as much as 90% the point the Fill in the blanks and try to retell the passage The Monarchs Journey. 3 Every autumn, North American monarch butterflies migrate a long way to California or Mexico. The journey is difficult. Recently,

22、 a team of scientists discovered that the butterfly could use the time of day and the position of the sun to find the right way to go. Research also finds out that the number of butterflies is falling greatly due to human activities. Studies let people know more about monarch butterflies and call on

23、 us to do more to protect them so as to increase their number and keep their place in nature. (92 words) A possible version Discussion Think and Share 1. What impresses you most about the monarch butterfly? 2. What can people do to help protect the monarch butterfly? Conclusion Reduce the use of pes

24、ticides and chemicals Plant more trees Do a wildlife survey Restore habitat I. Match the words and expression with their definitions. 1. The committee was asked to _ the cost of establishing a new nature park. 2. Half the worlds rainforests have already been _. 3. The blue _ is the largest living cr

25、eature in the world. 4. Deserts make up more than thirty _ of the Earths land surface. 5. The _ Ocean separates North America from Europe and Africa. 6. Place the plant in a bright sunny _ so that it gets enough light. 7. Scientists spent years _ an explanation for the Monarch Butterflys behaviour.

26、8. For our project, we _ the pollution produced by traffic on the roads near our school. Atlantic destroy determine measure percent position seek whale destroyed whale percent Atlantic position seeking measured determine II. Complete the sentences with the correct form of the words in the box. 1. Ca

27、n you describe how and why monarch butterflies migrate every autumn? 2. How human activity influence the butterfly? 3. What can people do to help protect the monarch butterfly? SelfSelf- -evaluationevaluation 1. Polish your summary of this passage. 2. Write a passage to show your opinions on the relationships between people and animals.