"Two Short Essays by Asimov" PPT Courseware 4

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"Two Short Essays by Asimov" PPT Courseware 4

about the author

Asimov, an American Jew, left his native Russia for the United States when he was a child. He studied biochemistry in his youth, and later devoted himself to writing and became one of the most prolific writers in the world. He has won the Hugo Award and the Nebula Award, which represent the highest honors in science fiction literature. He has published more than 300 science fiction novels and popular science works so far, and is recognized as the leading science fiction writer in the United States today.

Background introduction

For a long time, people have tried to explain the origin of the earth's land and oceans, and various hypotheses have been proposed. Now, geologists generally believe that 200 million years ago, all the continents on the earth were connected together. Later, for some reason, this super ancient continent was divided into two, and then divided into two, forming successively North America and Eurasia, Antarctica, Africa, South America, Oceania, New Zealand and the Indian subcontinent. This is the theory of continental drift that has caused a profound revolution in geology. In 1986, experts from the Argentine Antarctic Institute discovered dinosaur fossils in Antarctica, which provided strong evidence for this theory.

word accumulation

1. Read

Remains, folds, disaster

Dense Diffusion Repulsion

Meteorite melting traceability

Self-reading research

Please read the article carefully with the following two questions:

Why do we say “dinosaurs are everywhere?”

What inferences were drawn?

How did the author come to this conclusion? Please find out the trajectory of the author's thinking about the problem?

1. First reading of the text Discussion content

This article proves the continental drift hypothesis based on the fact that dinosaur fossils were found in Antarctica.

The objects explained in the text involve two subjects, namely: biology (dinosaurs) and geology (plate theory)

From this we understand something:

Different subject areas are closely connected. Discoveries in one field of science will certainly have consequences in other fields.

2. Read the text and appreciate the language

Compare the differences between the following two sentences and the original text, and tell which expression is more effective.

(1) There are many continents on the plate. When the plate moves in one direction or another, the continents also move together.

(Original sentence: The plates carry many continents on their backs. When the plates move in one direction or another, the continents also move with them.)

The original text uses anthropomorphic rhetorical techniques, which is more vivid and vivid than the revised text.

(2) After this Pangea existed for millions of years, it began to break up again. (Original text: After millions of years of existence, Pangea began to show signs of breaking up again.)

The original article explains that this Pangea is still very strong, but there are just some signs and signs of breaking up, not that it has begun to break up. The revised text does not conform to scientific reality.

(3) In the sixth paragraph, "It is the continents that are drifting, not the dinosaurs that are migrating." Are "drift" and "migration" interchangeable in this sentence, and why?

Not interchangeable. Because "drift" means that inanimate things move with the help of external forces, and "migration" means that living things move to a certain place with a purpose. After changing, it will not be accurate.

overall perception

1. What does the article think was the reason for the extinction of dinosaurs?

2. What two scientific hypotheses does this article propose about the reasons for the extinction of dinosaurs? Please explain these two doctrines.

Explain the "impact theory" and "volcano theory":

Impact theory: The devastating impact of a huge asteroid or comet on the earth was the cause of the extinction of many earthly creatures, including dinosaurs.

Volcano theory: The earth suddenly experienced a period of volcanic eruptions, which caused the extinction of a large number of creatures, including dinosaurs.

How did the article lead to the "impact theory"? Find text that expresses this content:

The rare metal iridium was found in thin layers of sediment formed 65 million years ago.

This could be the result of a giant asteroid or comet impacting Earth.

Causing volcanic eruptions, causing fires and large tidal waves, sending a lot of dust into the stratosphere, preventing sunlight from reaching the Earth's surface for a long time.

This may have been the cause of the extinction of all living things, including the dinosaurs.

4. Speed ​​reading texts and comparative reading

What are the similarities and differences between this article and the first article? (Compare in terms of explanation order, explanation method, explanation language, and explanation content)

Same point:

1. Explanation order: Both articles adopt a logical order, focusing on explaining the truth and explaining the layer by layer in a simple and easy-to-understand manner.

2. Explanation methods: Various explanation methods are used.

3. Explanation language: accurate, concise, simple and popular.

difference:

The angle of explanation:

"Dinosaurs Are Everywhere?" 》is to prove the theory of "plate tectonics" from the perspective of the ubiquity of dinosaur fossils.

"Squashed Sand" uses "squashed sand" to prove that the cause of death of dinosaurs was an alien impact.

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"Two Short Essays by Asimov" PPT download:

"Two Short Essays by Asimov" PPT download Part One: Learning Objectives 1. Clarify the ideas of the article. 2. Compare and analyze the illustrative objects and illustrative angles of the two essays. About the author Asimov, an American Jew, left his native Russia when he was a child...

"Two Short Essays by Asimov" PPT:

"Two Short Essays by Asimov" PPT Part One Content: New Lesson Introduction Learning Objectives 1. Understand the reasons for the extinction of the dinosaurs revealed in the article, and grasp the author's views explained in the two short essays. (Key points) 2. Clarify the order of explanations, analyze explanation methods and their functions, and understand...

"Two Short Essays by Asimov" PPT courseware 5:

"Two Short Essays by Asimov" PPT courseware 5 Introduction to the author's works: This article is selected from "New Frontier", written by Asimov (1920-1992), a famous American popular science writer and science fiction novelist. Phoneticize the red words: remains, folds, disaster, ornithischia, metal..

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Update Time: 2024-10-02

This template belongs to Chinese courseware Lu Jiao edition seventh grade Chinese language volume 2 industry PPT template

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