Unit 5 Revealing nature Starting out & Understanding ideas 课件-2023-2024学年高二英语外研版（2019）选择性必修第一册

外研选择性必修 第一册 Unit 5 Period 1 Starting out & Understanding ideas (I) 教学目 Lead-in 1 What species do you recognise in the picture? 2 What factors can cause the process of evolution? Paramecium, earthworm, snail, crab, fish, tortoise, bird, horse, human, frog...; alga, moss, fern, plant... The ever-changing environment of nature; environmental changes; population immigration; genetic mutation; cultural preferences... 1 2 To develop a sense of evolution by watching the video To get the main idea of the text and specific information about the journey of discovery 学习目标 目标一：To develop a sense of evolution by watching the video Activity 1: Look at the page from a science magazine and answer the questions. 1.What do you know about these animals? What makes them special? 2.What other similar animals do you know about? Share your knowledge with the class. They are all species that exist thousands of years on earth; They are old and rare (unusual). Background information The Komodo dragon The Komodo dragon is the largest lizard in the world. It can grow to three metres in length and can weigh about 135 kilograms. Despite its size and weight, it can run for short distances at up to 20 kilometres per hour. The Duck-billed platypus The duck-billed platypus is a small egg-laying mammal (up to 60 cm in length) found only in Eastern Australia including Tasmania. As its name suggests, it has a mouth that looks like a duck’s bill, while its thick fur and flat tail are similar to those of a beaver. Nautilus As one of the oldest sea animals in the world, the nautilus has hardly changed in about 500 million years, and that is why it is often given the name “living fossil”. Activity 2: Watch the video and answer the questions. 1 How can seeds travel? How can this benefit plants? 2 Can you think of another example of seeds travelling? Share it with the class. Seeds usually are carried by the wind, water, and animals. Plants can have a better chance at life. 目标二: To get the ma