Unit 5 Into the wild Understanding ideas 课件 高中英语外研版（2019）必修第一册.pptx

1瓮安二中：任安荣The Monarchs Journey3Learning Objectives Learning Objectives In this class,you are expected to:1.know the style of the scientific exposition,and think critically about the phenomenon.2.identify the cause and effects.3.have a better understanding of relationships between humans and animals and respect nature.to be curious,wise,logical,critical readersPara 5Measures5Be curious?6Be logicalChoose where you are most likely to find the passage.1 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.Be logical the structure of an exposition?mysterymigrationphenomenonand the causeWhen/where/whyhowThe Monarchs The Monarchs JourneyJourneymigrationmigrationpopulation crashSurvival?effect/troublesolution9Many animals move from one place to another at certain times of the year.This annual movement is called migration.They migrate to find food,seek a partner,or in search of warmer weather.One of the most wonderful migrations in nature is that of the North American monarch butterfly.Migration phenomenon and Read paragraph 1Be logical 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.10when?where?how long?Be logicalNorth AmericaCalifornia or MexicoRead paragraph 21112A 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.Be logicalWhat mystery have the scientists solved?cause and effect Read paragraph 313A 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.Be logicalWhat mystery have the scientists solved?the monarch is able to tell the time of day It uses its eyes to measure the position of the sunallow the butterfly to determine the way to goreach the places 1415Understanding ideas:THE Monarchs Journey A BcD16The solution to the mystery of the monarchs 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.Be logicalCauses and effects of the monarch population crash What has made its population by as much as 90 per cent?paragraph 417Be logicalThe research on the monarchs behaviour 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.solutionWhat is the solution to the problem?Read paragraph 5cause and effect Humans _ treesnatural environment kill the plantspopulation use chemicals to _ thatmonarch caterpillars eat.cut downdestroy_has crashed Be logical(3)Working together towill increaseenough plants to feed onMake sure if it works,the population_record its migrationsolutionBe logicalsurvivalTo protect the monarch is a long process.Significance Why do we make the reserch?Is it useful?Para5.Para5.tell?The more _,the greater_.we know about this lovely creaturethe chance it will survive and keep its place in the natural world for a long time to come 20(1)What impresses you most about the monarch butterfly?“Its population has crashed by as much as 90 per cent in“Its population has crashed by as much as 90 per cent in the last few years”the last few years”Be criticalThink and share:Think and share:It s high time that we should think over about It s high time that we should think over about the causes and take measures.the causes and take measures.22 At one with nature 天人合一天人合一Green development绿色发展23Protect her Protect ourselvesPoster Poster DesignDesignThink Think of a of a slogan to ca。