人教版 必修三 Unit 4 Astronomy: The Science of the Stars
Reading: How Life Began on the Earth
教学设计
Before the start of the new lesson, students are guided to know their learning objects of this lesson.
Learning Objects
Know the formation of the earth and the development of life
Try to make a summary of this passage
Be able to dub (配音) the short film with what you have learnt today
Lead — in
Ask students some questions.
“Do you know The Black Hole ? Have you seen it with your own eyes? In your imagination, what does it look like? ”
A science news will be shown to students.
This news will arouse students’ interest in learning science knowledge.
Prediction
There is a title and some pictures. Students will predict the main idea from this useful information.
What information can you get first?
What is the passage about? ____________________________________
Fast reading
Students will be required to read the whole passage as quickly as they can.(2mins)
How can we catch the main idea of each paragraph very quickly?
Students should read the topic sentence in each paragraph. A good reading method will be given to them.
Write down the main idea of each paragraph.
Para.1: A theory about ____________________
Para.2: The formation of __________________
Para.3: The importance of ___________ for life
Para.4: The development of __________ and ___________
Para.5: The arrival of _________ and their effects on the earth
These 5 paragraphs should be divided into 2 parts.
Para 1—3 are Part One that talks about how the earth developed.
Para 4—5 are Part Two that talks about how life developed.
Students will get the structure of the whole passage from this part. Their prediction is right.
Careful reading
Students are required to read part one carefully to explore the origin of the earth. When they read, they are supposed to pick out some key words not the long sentences. Then fill in the blanks. (3mins)
Part 1(Para 1--3)
settle into explode with fire and rock
Life cool down
Did water appear only on the earth?
Why is there life only on the earth?
According to this time clue, students are required to retell the development of the earth. They have 2 minutes to prepare. Some of them will be invited to stand in the front of the classroom to show themselves. (2mins)
Part 2(Para 4--5)
When they read this part, students should pay attention to the time, animals as well as plants. They are supposed to draw a timeline by themselves. (3mins)
Time Animals Plants
The teacher will explain the first picture to the students as an example. The students will explain the rest of the pictures.
According to this timeline, students have 3minutes to retell Part Two. Some of them will be invited to stand in the front of the classroom to show themselves. (2mins)
Making a summary
Students will put what they have learnt in this class into practice. They will make a summary according to these two time clues and write it down on their learning plan.
Dubbing the film
The teacher will show students a short video first. When the students enjoy it, they should combine their summary with this video and try to dub it. This film is about the development of the earth and life. This is the second time for students to practice their oral English, which will strengthen their confidence.
Homework
校报科学版邀请你给同学们写一篇关于地球和生命发展的短文。请你结合课文所学内容，写一篇介绍，要求100词左右。
课件25张PPT。How life began on the earth Learning Objects Know the formation of the earth and the
development of life
Try to make a summary of this passage
Be able to dub (配音) the short film with what you have learnt todayThe Black Hole ?How Life Began on the Earth TitlePictures？PredictionFast readingWrite down the main idea of each paragraph.
Para.1
Para.2
Para.3
Para.4
Para.5
The formation of _____________The arrival of ________ and their effects on the earthThe importance of ________ for lifeThe development of ________ and _______ A theory about _______________________how the universe was formed the earthplantswateranimalshumansCareful reading:Part 1 (Para 1-3) Development of the earthBig Bang1 2A cloud of dust A solid globe3explode with fire
and rocksettle into 4 WaterEarth's atmosphere Life on the earthcool down Why is there life only on the earth? The continued presence of water allowed the earth to dissolve harmful gases and acids into oceans and seas. This produced a chain reaction, which made it possible for life to develop.Part 2 (Para 4-5) Development of lifeCareful reading:Time
Animals
Plants
1.2. Draw a timeline by yourselfMany millions of years latershellfish and all sorts of fishsmall plants on the surface of the watersmall plants on the surface of the watershellfish and all sorts of fishNextMany millions of years latershellfish and all sorts of fishland animalssmall plants on the surface of the waterGreen plants on landgreen plants on land insects (on land)
amphibianson land and in the waterLand animalsLaterNextMany millions of years latershellfish and all sorts of fishland animalsreptilessmall plants on the surface of the waterGreen plants on landForestsreptilesdinosaurslay eggsLaterNextmammalsMany millions of years latershellfish and all sorts of fishland animalsreptiles65 millions years agoGreen plants on landForests small plants on the surface of the waterreptileslay eggsmammalsgive birth to young baby animals and produced milk to feed themLaterNextFinallymammalsMany millions of years latershellfish and all sorts of fishland animalsreptiles65 millions years ago humansGreen plants on landForests small plants on the surface of the waterMany millions of years laterLatershellfish and all sorts of fishNextland animalsreptilesmammals65 millions years agoFinally humansBig BangA cloud of dust A solid globeexplode with
fire and rocksettle into WaterEarth's atmosphere Lifecool down Make a summary(声临其境)DubbingThe universe began with a Big Bang … …Homework校报科学版邀请你给同学们写一篇关于地球和生命发展的短文。请你结合课文所学内容，写一篇介绍，要求100词左右。Learning plan of how life began on the earth
Learning Objects
Know the formation of the earth and the development of life
Try to make a summary of this passage
Be able to dub (配音) the short film with what you have learnt today
Prediction
What is the passage about? ____________________________________
Fast reading
Write down the main idea of each paragraph.
Para.1: A theory about ____________________
Para.2: The formation of __________________
Para.3: The importance of _________ for life
Para.4: The development of ________ and ________
Para.5: The arrival of _________ and their effects on the earth
Careful reading
Part 1(Para 1--3)
settle into explode with fire and rock
Life Cool down
Part 2(Para 4--5)
Time Animals Plants
Make a summary
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Homework
校报科学版邀请你给同学们写一篇关于地球和生命发展的短文。请你结合课文所学内容，写一篇介绍，要求100词左右。
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