Unit 5 A delicate world Starting out 教案-2022-2023学年高中英语外研版（2019）选择性必修第二册

Unit5 A delicate world Period1 Starting out教案 Topic Starting out Teacher Teaching Aims: 1. Encourage the students to perceive the diversity of the earth’s ecosystem and the interdependence of all living things. 2. Stimulate the students' interest in the topic,and warm up for the whole unit. Teaching important Points: 1.Lead the students to analyze the title. 2.Lead the students to master the key words and the phrases of this part. Teaching difficult points: 1. Guide the students to observe and compare three satellite photos of the Aral Sea and discuss the possible changes taking place in the Aral Sea. 2. Guide the students to imagine the future changes of the Aral Sea and analyze the causes of these changes, and think about the impact of human activities on the earth. Teaching methods: Task-based Language Teaching Question-inquiry Teaching Computer-assisted Teaching Teaching type: Speaking 课 时 one Teaching procedure: Teaching contents: Lead-in Task 1. Task2. Summary Homework Lead the students to watch the video to understand that human beings are part of the earth's ecosystem . Step l:Play the video, ask the students to watch it and try to answer Question 1. Step2: Play the video again and ask the students to check if they got the answer right. Step 3:Ask the students to work in groups and discuss Question 2. Questions: 1. Are humans part of Earth's ecosystems? Why? 2. In what ways can humans affect ecosystems? Answers: 1. Yes. Humans are part of Earth's ecosystems. Because all the living things live in ecosystems and people are living things. 2. Humans can affect ecosystems in positive and negative ways. For example, to have a positive influence on ecosystems, people can plant trees, feed and protect animals, recycle things, etc. However, deforestation, air and water pollution and excessive waste affect ecosystems in a negative way. Show the students to observe three satellite photos of the Aral Sea taken in different eras. Then lead t