Unit 5 Revealing Nature Listening and speaking 课件-2023-2024学年高二英语外研版（2019）选择性必修第一册

Unit 5 Period 3 Listening and Speaking 新 课 导 入 What is your understanding of biodiversity? 课 堂 学 习 1 Listen to the podcast and choose the statements that are made. 1. Biodiversity is important. 2. Bacteria are always harmful to humans. 3. Some species of bacteria are used in food production. 4. Many species of bacteria recycle dead organic matter. 5. Our immune systems are able to fight off all germs. 2 Listen again and complete the fact sheet. Cells •Every living thing is 1 __________________________. They are like 2 _________________________________. •In the human body there are about 3 _________________ human cells and around 4 _________________________ bacteria cells. made up of cells bricks that are used to build houses thirty trillion thirty-nine trillion Bacteria •Most bacteria in the human body can 5 _____________________ •In the food production process, bacteria can 6 __________ dead organic matter. help with digestion break down Now work in pairs. Discuss what you know about cells and bacteria. 3 Complete the boxes with the expressions from the podcast. • Do you know about...? • Have you heard of...? • By the way, ... • In fact, ... • Actually, ... • Speaking of which, ... Checking background knowledge Adding information • By the way, ... • In fact, ... • Actually, ... • Speaking of which, ... • Do you know about...? • Have you heard of...? 4 Read the passage and answer the questions. Earth is home to millions of different species. Some can be very small, like bacteria and viruses, which are so small that we cannot see them with only our eyes. By contrast, the largest animal species so far found on our planet is the blue whale, which can grow up to almost 30 metres in length and weigh over 130,000 kilos. The toughest species is probably the water be