Unit 5 第2课时 Understanding ideas（ppt课件+视频）-2022新外研版（2019）《高中英语》必修第一册.rar

Unit 5 Period 2Unit 5 Period 2Understanding ideasUnderstanding ideasWhat does the video mainly talk about?What does the video mainly talk about?It talks about monarch butterflies amazing It talks about monarch butterflies amazing migration to Mexico.migration to Mexico.Watch and think:1.Students are able to get the main idea and details of the passage;2.Students can grasp some useful reading skills;3.Students can figure out the importance of protecting animals and raise the awareness of harmony between man and nature.Learning aims Read the passage and finish Ex.I and Ex.II(了解感知和深入学习了解感知和深入学习)on your learning paper.Please disscuss your confusions with your group members.Requirements(Requirements(Requirements(Requirements(要求要求要求要求):):):):1.6 minutes;1.6 minutes;1.6 minutes;1.6 minutes;2.When discussing2.When discussing2.When discussing2.When discussing，stand upstand upstand upstand up；after finishingafter finishingafter finishingafter finishing，sit down.sit down.sit down.sit down.3.Check your answers and discuss your confusions.3.Check your answers and discuss your confusions.3.Check your answers and discuss your confusions.3.Check your answers and discuss your confusions.What is the main idea of the passage?A.The monarchs migration.B.The reasons for monarchs migration.C.Mexicos monarch.Task1Go through the passage quickly and answer the questions.TipsThe main idea of a passage can be found from its title,the topic sentence,or even the pictures.TipsTitleThe topic sentencePicturesRead the passage and find out what mystery the scientists have solved.Task2The scientists have solved the mystery of how monarch butterflies manage to travel a long distance and find their way to their destination.2P501.In a scientific research paper about the monarch butterflys migration.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.Task33P521.Why do many animals migrate?(Para.1)2.How does the monarch determine the way to go?(Para.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.Task41.They migrate to find food,seek a partner,or in search of warmer 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 and people have been working together to record its migration and make sure there are enough plants for it to feed on.Check your answers!Complete the sentences with expressions from the passage.Then use sentences to complete the“cause-effect”flow chart.Task54P52da.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 daythe way to gothe position it will spend the wintera/cc/abof the sunthe places whereCheck your answers!he.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 downnatural environment of many placeskill the plants(by as much as 90 per cent)e/gg/efhas crashed analyzing,mindmap,summary,retellingThe monarchs journeyThe definition of migrationThe background to the monarchs migration The mystery of the monarchs migration The trouble of the monarch Its solution Learn to understand the passage.1Influences of human activities on the monarchTheMonarchs JourneyWhereTimeHowEvery _Travel around 4000 km south to _or _Use _ to measure_ _and _ _ Main causes:_such as _ and _cutting down treesusing chemicalsSolution:Make sure that there are _for it to feed onenough plantsautumnCaliforniaMexico time of the day eyeswhere the sun is in the skyhuman activityTrouble:_ its population has crashed by as much as 90%the point the Every autumn,North American monarch butterflies migrate a long way to California or Mexico.The journey is difficult.Recently,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 us to do more to protect them so as to increase their number and keep their place in nature.(92 words)A possible versionThank you