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课件网) Unit 5 Into the wild 外研版高中英语必修一 To skim the passage by focusing on key words to get the main idea To understand the monarch butterfly’s features and how it migrates To know why the number of monarch butterflies falls and what people should do to improve the condition Look at the pictures and choose the animals that migrate. monarch butterfly Siberian crane Atlantic salmon red panda killer whale African lion The animals that migrate include monarch butterfly, Siberian crane, Atlantic salmon, and some types of killer whales. Talking Now talk about what you know about animal migration. Enjoy a video about Monarch migration. The Monarch’s Journey 1 AI place to another at certain any animals move from one 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. 2 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 the sun is in the sky- allow the to California or Mexico. Howeve,until recently no one knew how they did this. 3 A team of scientists led by ProfessorEli 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, butterfly to determine the way to go. Eventually, it manages to reach the places where it will spend the winter. 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. 5 The research on the monarch's 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. Read the passage and find out what mystery the scientists have solved. The scientists have solved the mystery of how monarch butterflies manage to travel a long distance and find their way to their destination. Choose where you are most likely to find the passage. In a scientific research paper about the monarch b ... ...
