Unit 4 Grammar and composition & Integrated skills 课件-2022-2023学年高中英语牛津译林版（2020）选修第一册

U4 Fun with science grammar& integrated skills P48 1. Why is the saying “no two snowflakes are alike” mentioned in Paragraph 1? Discussion To introduce the “Snowflake Man”: Wilson Bentley. He discovered that no two snowflakes are ever exactly the same. 2. How did Wilson Bentley capture the world’s first image of a single snowflake? He attached his camera to a microscope and set up his equipment outside. He worked in the freezing cold for hours at a time, carefully handling each snowflake with a feather, and photographing it with a 90-second exposure. 3. What qualities does Wilson Bentley have? Can you support your opinion with evidence from the story? Discussion He was a person with great determination and persistence. Over the decades, Bentley photographed more than 5,000 snowflakes. Through many years of trial and error, he explored the secrets hidden from human eyes. Eventually he discovered that no two snowflakes are ever exactly the same. p49B2 1. What makes the existence of snowflakes possible? Discussion The dust particles. 2. Why do snowflakes take on an endless variety of shapes? The shapes of snowflakes are influenced by temperature and humidity during their downward journey through the Earth’s atmosphere. Each snowflake takes a different route and thus it encounters a unique mix of atmospheric conditions. 1. What is your understanding of friction? Friction is a common phenomenon in our daily life. Friction happens when two surfaces slide against each other. 2. What examples can you give about friction in your daily life? Friction can occur between solid surfaces, like your two hands rubbing together or drilling a nail into the wall. Friction can occur in liquids or gases, like friction with the water slowing down a boat or the air slowing down your car. 1. What does “resist” in the title mean? In the title, the verb “resist” has a double meaning. It can mean “to refuse to accept something and try to stop it from happening”. Meanwhile, it can mean “to st