Teaching objectives
1. Know 13 new words such as "dull and only", write 15 words such as "stupid", and read and write 15 words correctly.
2. Read the text silently, write down the questions you don't understand and try to solve them.
3. Understand the accuracy of words and expressions in the text, and systematically retell the process of dinosaurs flying to the blue sky.
Emphasis and difficulty in teaching
1. In the process of reading, you can ask questions you don't understand and try to solve them.
2. Understand the accuracy of words and expressions in the text, and can systematically retell the process of dinosaurs flying to the blue sky.
Teaching preparation
1. preview outline: text preview homework.
2. Preparation materials: multimedia courseware.
Teaching time is 2 hours.
Lesson 65438
Class goal
1. Know 13 new words such as "dull and only", write 15 words such as "stupid", and read and write 15 words correctly.
2. Read the text correctly and smoothly, perceive the content of the text as a whole, and make clear the level of the text.
teaching process
First of all, stimulate interest and introduce new lessons.
1. The teacher knows that many boys in our class like dinosaurs. Who can briefly introduce dinosaurs you know? (student exchange)
2. Introduction of dinosaur: "Dinosaur" means "terrible lizard" and was named by British scientist richard owen. Dinosaurs are a kind of reptiles that appeared in Mesozoic (Triassic, Jurassic and Cretaceous). Dinosaur family members are diverse and vary in size. The big and bulky body can surpass the elephant; Small, light and flexible body resembles a rooster. The sudden extinction of dinosaurs at the end of Mesozoic has become a mystery in the evolutionary history of life on earth. The dinosaurs we know now were recovered from excavated dinosaur fossils.
3. Enjoy dinosaur pictures. After reading these pictures, what impression did dinosaurs leave on you?
4. How did dinosaurs fly to the blue sky? Today, we will learn "Dinosaurs Flying in the Blue Sky" and read the topic together.
Second, read the text for the first time and clear the word barriers.
1. Who can help students solve problems through preview?
2. Know new words. (Courseware demonstration)
3. Focus on guiding the writing of Tunnel and Wings: the word "tunnel" ends with "parallel"; The "wing" is divided into upper and lower parts, so pay attention to compactness when writing, and the second horizontal direction of "common" is longer.
4. Understand the meaning of words. (communicate with each other)
5. Read the part you are interested in to everyone.
Third, read the text again and make clear the level.
1. Read the text and tell me what it is mainly about. This is a popular science article, which mainly introduces a hypothesis put forward by scientists according to research: birds are probably descendants of a small dinosaur. At the end of the 20th century, China scientists first discovered feathered dinosaur fossils in western Liaoning, which provided evidence for people to imagine dinosaurs flying into the blue sky and becoming birds. )
2. Briefly summarize the meaning of each part of the text.
The first part (1): tells us that in Mesozoic, a branch of dinosaur finally became a soaring bird after a long evolution.
The second part (2): The process of writing this important scientific discovery.
The third part (3~4) introduces the evolution of dinosaurs flying into the blue sky.
The fourth part (5) expresses the good wishes of scientists-hoping to find more and more sufficient evidence to fully reveal the historical process of dinosaurs flying into the blue sky.
Fourth, exchange feelings and taste sentences.
1. How do you feel after reading the text? Find out the sentences accurately expressed in this article.
2. Show sentences and read experiences.
(1) A branch of dinosaurs experienced a long evolution and finally became a bird soaring in the sky. ("One" refers to a certain branch of dinosaurs, not all of them; "Long evolution" refers to a long evolutionary process, not a sudden change. )
(2) Some dinosaurs closely related to birds should have feathers. ("Some" means not all dinosaurs; "Should" means that this is a speculation, which means that we can't be sure until we find the evidence. )
(3) Scientists hope to fully reveal this historical process. ("comprehensive" means that scientists hope to find more and more sufficient evidence. )
second kind
Class goal
1. Understand the content of the text and can systematically retell the process of dinosaurs flying into the blue sky.
2. Experience the accuracy of language expression in the text.
First, check the import.
Last class, we knew the new words and made clear the level of the text. In this lesson, we mainly studied how dinosaurs flew into the blue sky.
Second, in-depth study and exchange of feelings
(1) Learn paragraphs 1 and 2 of the text.
1. What are the characteristics of dinosaurs and birds? (dinosaur: fierce, heavy and dull; Bird: Light and colorful. )
2. What is the relationship between dinosaurs and birds? In the Mesozoic era, a branch of dinosaurs finally became a bird soaring in the air after a long evolution. )
3. What hypotheses have scientists put forward after research? What is the basis?
At the end of the 20th century, China scientists first discovered feathered dinosaur fossils in western Liaoning, which immediately made researchers all over the world ecstatic. The discovery in western Liaoning showed the world the evidence that dinosaurs had feathers, which made the finishing touch for this picture drawn by paleontologists.
What an important discovery this is! Let's look at these words and understand the mood of scientists at that time. (ecstatic)
(2) Learn the third and fourth paragraphs of the text.
1. Read paragraphs 3 and 4 silently and think about how dinosaurs evolved into birds. Draw words describing the characteristics of dinosaurs and prepare to communicate.
2. Communicate with the whole class.
(1) The first dinosaur on earth appeared about 240 million years ago. It is about the size of a dog, and its two hind legs are strong enough to support the whole body.
Can you delete "about"? Why? (No way. "About" refers to inaccurate "estimation", which embodies the rigor of interpretation language. )
(2) After tens of millions of years, its descendants have multiplied into a huge family with different forms. Some dinosaurs walked on two legs like their ancestors, while others walked on four legs. Some dinosaurs were tens of meters long and weighed dozens of tons. Some dinosaurs were very small and weighed less than a few kilograms. Some dinosaurs are fierce and abnormal, they are carnivores, eating meat and drinking blood; Some dinosaurs are gentle and lovely. They eat plants.
What are the characteristics of these sentences? (contrast, parallelism)
What are the advantages of writing like this? (Highlight the characteristics of different dinosaur families. )
The members of the dinosaur family are really different in shape! Please read their differences. (men and women compare reading. )
(3) Among them, some carnivorous dinosaurs gradually became smaller and more like birds: hollow bones and light bodies; The skull is enlarged and moves quickly; The front legs are getting longer and longer, and they can flap like bird wings; They have grown beautiful feathers, and there are no scales or scales on them. In order to avoid enemies or find food, some of them may move to trees to survive.
What do you mean "some of them"? Not all dinosaurs expressed accurately. )
(4) These arboreal dinosaurs jumped and landed among trees, gradually gained gliding ability, and finally were able to fly autonomously. However, another view is that flight does not begin with the process of arboreal life. Some scientists speculate that a feathered dinosaur that lived on the ground learned to fly while running.
How did dinosaurs learn to fly? Scientists have given two conjectures: starting in the process of arboreal life and learning in the process of running. )
(5) Whether the arboreal life enables birds to glide and fly gradually, or the feathered dinosaurs living on the ground learn to fly in the running process, the final result is that dinosaurs who can't fly eventually become favored birds, and they fly into the blue sky, thus opening up a new life world.
(3) Learn the fifth paragraph of the text.
It is only scientists' speculation that dinosaurs flew into the blue sky. What are their better wishes? Read paragraph 5 in its entirety.
Third, expand and extend.
1. How do you feel after learning this article?
Scientists know that dinosaurs evolved into light and flexible birds through research, but it will take a long time to fully reveal this historical process. What do you want to say to scientists?
Fourth, homework
1. Introduce the evolution of dinosaurs into birds and fly to the blue sky to their parents.
2. Practice writing: write different characteristics of things in a comparative way.