Unit+4+Grammar+and+composition+&+Integrated+skills+ 高中英语牛津译林版（2020）选修第一册.pptx

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1、U4 Fun with sciencegrammar&integrated skillsP48 1.Why is the saying“no two snowflakes are alike”mentioned in Paragraph 1?DiscussionTo introduce the“Snowflake Man”:Wilson Bentley.He discovered that no two snowflakes are ever exactly the same.2.How did Wilson Bentley capture the worlds first image of

2、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

3、 opinion with evidence from the story?DiscussionHe 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 snowflak

4、es are ever exactly the same.p49B2 1.What makes the existence of snowflakes possible?DiscussionThe 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 Earths atmosphere.E

5、ach 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 yo

6、ur 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

7、 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 stop yourself from having something you like or doing something you very much want to do”.Friction is unavoidable in daily life and has great mystery,which has been

8、 fascinating scientists for centuries.2.How did Leonardo da Vinci learn about friction?He experimented with friction by sliding objects across different types of surfaces and made the connection between friction amount and its determining factors such as surface texture,even with the limited technol

9、ogical knowledge available then.3.What is the value of the milestone in the 21st century?This finding could expand our understanding of physical systems that depend on friction,from micromachines to earthquakes.4.Questions on p50I think it has two meanings:in the natural world,friction is a force that is found everywhere and difficult to get rid of;on the other hand,friction is so fascinating and important that it attracts scientists to study and learn more about it.