1. Make clear the explanation content and order of the article, and learn the accurate, thorough and concise language features of this article.

2. Cultivate students' inquiry habits, scientific awareness and innovative thinking.

(A) teaching focus: clear the order of this article, cultivate students' inquiry habits. Learn the accurate, thorough and concise language features of this article.

(B) Teaching difficulties: to cultivate students' scientific awareness and innovative thinking.

Second, the teaching design

(1) import

1, dinosaur related pictures, and description:

Dinosaurs used to be giants on the earth, the heaviest of which could reach 90 tons (at present, elephants only have 6 tons). They once "ruled" the earth for 900 ~ 1200 years10.7 billion years, and once dominated for a while. But 65 million years ago, dinosaurs became extinct, leaving only a variety of dinosaur fossils around the world. So what secrets will these fossils tell us? Please see how Asimov, a famous American popular science writer and science fiction writer, solved the mystery for us. (Title and author of blackboard writing)

The title of the text is "Dinosaurs Everywhere". What conclusions do you have after reading the title?

Default: Health: indicates that dinosaurs are all over the world.

Teacher: Is there one in Antarctica?

Health: dinosaur fossils have been found in Antarctica.

Teacher: When did you find out? Tell me specifically. Read the second paragraph.

Teacher: If someone tells us that dinosaur fossils have been found in Antarctica, what's your first thought? What will naturally come to your mind?

Health 1: It is a pterodactyl, which can fly to the South Pole.

Health 4: There has been a disaster in the mainland. Dinosaurs migrated. Like volcanoes.

Teacher: Why do they exist on all continents? Combine the scientific knowledge we have learned.

Health: The mainland is drifting. Took the dinosaurs.

Teacher: You have many arguments. Which do you think is more convincing?

Teacher: It seems that the conjecture of continental drift is more convincing.

The first reading of the text clearly explained the content.

Multimedia displays the following questions in turn:

Discussion: Answer these two questions completely in concise language.

(c) Study the text to clarify the sequence of notes.

1. Thinking: See how the author asks questions, looks for answers and draws conclusions.

Group discussion, teacher patrol guidance. According to the speeches of the students in each group, sort out the author's ideas.

Ask a question: dinosaur fossils were found in Antarctica-dinosaurs didn't adapt to the Antarctic climate-how did they cross the ocean to another continent?

Looking for the answer: It was the continents that drifted, not the dinosaurs themselves-the theory of continental plate tectonics was put forward-when Pangaea was formed, all the lands seemed to be in tropical and temperate environments, so dinosaurs could live comfortably in different parts of Pangaea-later Pangaea was divided into four parts-and each continent took its own dinosaurs.

2. According to the above analysis, what conclusion does the author draw?

Conclusion: The ubiquity of dinosaurs is a powerful new evidence to support the theory of plate tectonics.

3. In what order did the author explain it?

Ask questions-make assumptions-reason-draw conclusions

Here, the author adopts a logical explanation sequence of tracing the source, from cause to effect, focusing on explaining things and dissecting abstract scientific knowledge layer by layer, which is rigorous, simple and easy to understand. (Form a blackboard writing)

(d) Read the text carefully, accurately and concisely.

Transition: The reason why the author can introduce abstract scientific knowledge in a simple and easy-to-understand way lies not only in the proper explanation order, but also in his meticulous and accurate explanation language.

(Note: If beautiful and lyrical prose is a gorgeous evening dress, then plain and rigorous discussion is a simple shirt. If beautiful and lyrical prose is a picture rendered by Dan Qing, then plain and rigorous exposition is rigorous and accurate painting. )

1. But the teacher read this article and found that Asimov was not confident at all. Look at the following sentence:

(1) Some plates are pulled apart, while others are squeezed together, and one plate may slowly dive under the other.

All the land seems to be in tropical and temperate environments, so dinosaurs can live comfortably in different parts of Pangea.

(3) About 100 million years later, the climate is getting colder and colder, plants are becoming scarcer and scarcer, and the types and numbers of animals are greatly reduced. The climate is getting colder and colder, the summer is short and cold, and finally it becomes ice and snow.

"Look, maybe. May be "used too much, giving people a sense of insecurity. "Do you agree with me?

Discuss and get the accuracy of the explanation.

2. The teacher found that Asimov was sometimes too confident. "A new discovery in one scientific field is bound to have an impact on other fields." what do you reckon ?

Discuss and get a thorough explanation.

3. 12 paragraph "By 65 million years ago, all dinosaurs were extinct for one reason or another, and the mainland was completely separated." Replace it with "65 million years ago, the climatic conditions changed greatly and the living environment of dinosaurs deteriorated day by day." After all, the food provided by nature is limited, and the dinosaur's appetite is amazing. More importantly, their bodies failed to adapt to the changes in the external environment. The dinosaurs were all extinct and the mainland was completely separated. " Is it okay?

Discuss and get a concise explanation.

4. Can you give examples from the article to illustrate that the language is thorough, accurate and concise? (Guiding methods-deletion method, substitution method, etc. )

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