Unit 5 Into the wild Understanding ideas 课件-2024-2025学年高中英语外研版（2019）必修第一册

Unit5 The Monarch’s Journey Understanding ideas By the end of this class, you will be able to ●master the main idea of the passage. ●figure out the structure of the expository text (说明文) by drawing the “cause-effect” flow chart. ●learn the mystery of the monarch’s migration,the reason why its population is crashing and know how to take measures to protect it. ●raise the awareness of protecting all the wildlife in nature. Learning objectives: Leading-in They are wild geese(大雁) .They are flying south to search for the warmer weather.Every Spring ,they will fly back to the north to reproduce or give birth to babies. This annual movement is called migration(迁徙). Look and choose the animals that migrate. monarch butterfly 黑脉金斑蝶 Siberian crane 西伯利亚鶴 red panda 红熊猫 Atlantic salmon 大西洋鲑鱼 killer whale 虎鲸 African lion 非洲狮 √ √ √ √ Predict what the text will be about Topic Details The main idea of a passage can be found from its title, the topic sentence, or even the pictures. The monarch’s migration Time Reason The route (路线) How to reach the estination ... While-reading Para 1 The measures to protect the monarch Para2&3 The monarch ’s trouble and reasons Para 4 The definition about migration Para 5 The introduction of the monarch’s migration Activity 1 Scan the passage and match the main ideas with each paragraph What type does the passage belong to? An expository text(说明文) Para 1 ①Many animals move from one place to another at certain times of the year. This annual movement is called migration. ②They migrate to find food, seek a partner, or in search of warmer weather. ③One of the most wonderful migrations in nature is that of the North American monarch butterfly. Activity 2 Listen to the passage and find the key information of each paragraph While-reading The Monarch’s Journey 1.What is the function of this paragraph? ① What is called migration ? ② The purpose of animals’ migration ③ Introduce the topic to be discussed in this passage While-reading √ While-reading Para 2&3 Every autumn, millions of these beautiful insects with fine black and orange wings begin a long and difficult journey. Somehow they manage to travel around 4,000 kilometres south and find their way to California or Mexico. However, until recently no one knew how they did this.A team of scientists led by Professor Eli Shlizerman at the University of Washington has now found the answer. They have found out that the monarch is able to tell the time of day. It uses its eyes to measure the position of the sun. These two pieces of information - the time of day and the point where the sun is in the sky - allow the butterfly to determine the way to go. Eventually, it manages to reach the places where it will spend the winter. While-reading Task1.Please tell me the time and the route of the monarch’s migration Task2.Please find out what mystery the scientists have solved. The north America Canada California Mexico 地图出自：普通高中教科书 英语必修一， 外语教学与研究出版社， 2019.6 版， 第50页 a. The monarch butterfly is able to tell_____________. b. Using these two pieces of information, the monarch butterfly determines ____________. c. The monarch butterfly measures _____________ _______with its eyes. d. The monarch butterfly reaches _______________ ___________________. Task3. Complete the sentences and the “cause-effect” flow chart. Task3. Complete the sentences and the “cause-effect” flow chart. a. The monarch butterfly is able to tell_____________. b. 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 places where the sun it will spend the winter the position of b d a c Para 4 The solution to the mystery of the monarch's amazing ability comes at a time when it is in serious trouble. Its population has crashed by as much as 90 per cent in the last few years. Sadly, human activity is the main reason why the number of monarch butterflies is falling. In many of the places where the butterfly can be found, people are destroying the natural environment. They cut down trees and use chemicals that kill the plants that monarch caterpillars eat. While-reading While-reading Para 5 The research on the monarch's behavior has however led to a greater awareness of this creature. People have been working together to record its migration and make sure that there are enough plants for it to feed on. If this works, there may come a time when the number of monarch butterflies increases once again. The more we know about this lovely creature, the greater the chance it will survive and keep its place in the natural world for a long time to come. e.Humans _________ trees. f.The______________________________ where monarchs can be found is destroyed. g.Humans use chemicals that_______________ that monarch caterpillars eat. h.The monarch butterfly’s population___________ _______________________ in the last few years. Complete the sentences and the “cause-effect” flow chart. Complete the sentences and the “cause-effect” flow chart. e. Humans _________ trees. f. The______________________________ where monarchs can be found is destroyed. g. Humans use chemicals that_______________ that monarch caterpillars eat. h. The monarch butterfly’s population___________ _______________________ in the last few years. cut down natural environment of many places kill the plants by as much as 90 percent has crashed f h e g While-reading What efforts have been made to protect them ? Activity3 Choose where you are most likely to find the passage. 1 In a scientific research paper about the monarch butterfly's migration. 2 In a popular nature magazine introducing the monarch butterfly. 3 In a travel leaflet encouraging people to visit North America. a scientific research paper a travel leaflet Post-reading Activity 4 Think and share: 1.What impresses you most about the monarch butterfly? It said, “Its population has crashed by as much as 90 percent in the last few years” in the text. This gave me a huge shock. It' s high time that we should think over our behavior and take measures to protect them and all of the wildlife. Let’s live in harmony with each other. Post-reading 2.What can people do to help protect the monarch butterfly? Activity 4 Think and share: ●Plant native milkweed species to feed on ●Do not use chemicals that kill the plants as much as possible ●Protect their natural environment Watch the video about Monarch butterflies’ amazing migration Three months ____(late) ,they will fly back north for the summer. But this year there will be far ______(few) butterflies reaching their destination(目的地). Four out of Ten will die ________ __lack of food. Despite crashing in numbers,their dreamlike migration of the monarchs remains a springtime ________(wonderful).Scientists are asking for their path to be preserved(保护).It’s high time that we should think over our behavior and take _________(measure). Post-reading Activity 5 Complete and read Three months ____(late) ,they will fly back north for the summer.But this year there will be far ______(few) butterflies reaching their destination(目的地). Four out of Ten will die _______ __lack of food. Despite crashing in numbers,their dreamlike migration of the monarchs remains a springtime ________(wonderful). Scientists are asking for their path to be preserved(保护).It’s high time that we should think over our behavior and take _________(measure) . later fewer because of wonder measures Post-reading Activity 5 Complete and read Homework 1.Retell the story about the monarch’s migration to your friends. 2.Write a passage about the monarch or your familiar endangered species,including its present situaton, the reason for crashing of its population and human’s protective measures and so on. Thank you! $$