The first volume of eighth grade Chinese courseware: two essays by Asimov

Chapter 1 [Teaching Steps]

First, preparation before class

1. Arrange students to collect information about

The first volume of eighth grade Chinese courseware: two essays by Asimov

Chapter 1 [Teaching Steps]

First, preparation before class

1. Arrange students to collect information about dinosaurs one week in advance, which can be found in books, newspapers, computers, etc. And the record is good.

2. Teachers can make courseware.

Second, classroom learning.

1. Introduce a new lesson

Multimedia display, introducing the topic of "dinosaur".

2. Introduction to "Broken Sand"

(1) Show the introduction theme:

What are the two points raised in the article?

What is the author's opinion? How does the author prove that one of the viewpoints is correct? What is the author's conclusion?

② Students study the text, explore independently and form a conclusion.

By answering the above topics by name, teachers and students * * * form the following conclusions, which are displayed by multimedia:

Viewpoint: "Impact Theory" and "Volcano Theory".

Explanation: Put forward two viewpoints and prove that one of them is correct.

Interpretation basis: the formation and nature of seasonality.

Conclusion: The extinction of dinosaurs was not caused by volcanic activity, but by impact.

③ Teacher's summary: The article is written in the logical order of "asking questions-analyzing problems-solving problems".

3. Read "Dinosaurs Everywhere"

(1) Teachers' guidance on studying law:

It is a good learning method to read and analyze the writing ideas of explanatory articles from the perspective of "asking questions-analyzing problems-solving problems"

② Students' learning practice:

Learn the text Dinosaurs Everywhere by yourself with the above learning methods; Report the learning results by name and evaluate them jointly by teachers and students.

Third, language practice activities

1. Activity theme: Dinosaur activity requirements in my eyes: According to the information collected before class, introduce what you know about dinosaurs and related topics.

2. Activity theme: I came to the age of dinosaurs. Activity requirements: reasonably imagine and show your creativity.

Student activities are jointly evaluated by teachers and students.

Chapter II Teaching Objectives:

Knowledge target

1. Scientific discoveries in different fields can inspire each other, find new arguments or draw new conclusions.

2. Two short articles describe the research results.

3. The writing order, explanation methods and language features of the essays.

Ability goal cultivates students' innovative consciousness, innovative thinking and innovative ability.

Affective goal

1. Science needs bold speculation, reasonable imagination, logical analysis and verification.

2. Learn to think about observed natural phenomena from different angles.

3. Read popular science articles extensively, broaden your horizons and increase your knowledge.

Teaching emphasis: understand what the two short articles explain, the order and method of explanation.

Teaching difficulties: Scientific discoveries in different fields can inspire each other, so as to find new arguments or draw new conclusions.

Teaching step

Introduce a new course

Dinosaurs used to be giants on the earth. They once ruled the earth with 900 ~ 1200 genera10.70 billion years, and then disappeared together. How it died out is still a scientific mystery. This paper aims to solve this mystery. After reading it, students will compare it with other viewpoints they know to see which one is more convincing.

Second, overall perception.

Read the text by yourself and think about the problem:

1. What are the two opposing theories about the extinction of dinosaurs 65 million years ago? What is their basis?

In this article, the author intends to explain how dinosaurs became extinct.

The discussion is clear:

1. There are two opposing theories about the extinction of dinosaurs in 65 million years: "impact theory" and "volcano theory".

The basis of "impact theory": Rare metal iridium was found in a thin layer of sediment formed 65 million years ago, and its content was extremely rich. Some people think that this may be the result of a huge asteroid or comet hitting the earth. This impact may have penetrated deep into the earth's crust, triggering volcanic eruptions and triggering fires and tsunamis. A large amount of dust entered the stratosphere, and as a result, sunlight could not reach the surface of the earth for a long time. This may be the reason for the extinction of many earth creatures, including all dinosaurs.

The basis of "Volcano Theory": If the earth suddenly experiences a volcanic eruption period and multiple volcanoes erupt at the same time, it can also cause great disasters and make a large number of creatures extinct.

The author intends to explain that the reason for the extinction of dinosaurs is not volcanic activity, but impact.

Three key and difficult learning and goal completion processes

Read the text again and think:

1. Among the reasons for the extinction of dinosaurs, why did the author choose the "impact theory" and deny the "volcano theory"?

The discussion is clear:

In the author's view, a proven theory can be established.

The author introduces the experimental research results of scientists in the former Soviet Union:

A cubic inch of broken sand is much heavier than a cubic inch of ordinary sand. This kind of broken sand is therefore called timely.

The atoms in time are so closely bound that under normal circumstances, time can last for millions of years. (Description of column number)

Time has been found in some places, and there is evidence that these areas have been hit by huge meteorites. (give an example)

Time was also found in the original bullet explosion site, which was formed by the huge pressure of the expanding fireball. (give an example)

Judging from the above two cases, the author thinks that it should also appear in the deep crust with extremely high pressure.

So far, no seasonality has been found in the volcanic active area. The author thinks that the deep crust can be brought to the surface by volcanic eruption. But the eruption temperature is extremely high, and the rocks will be melted, so any time carried by the volcano will be converted into ordinary silica.

(4) Summary and expansion

1. Students take out their own information about dinosaurs and their extinction, communicate with each other, see which theory they are most interested in, and explain why they are interested (the scientific basis for the establishment of that theory).

2. Scientific discovery itself is a scientific achievement. The research on scientific discovery will also produce a series of scientific achievements, even interdisciplinary and cross-disciplinary. Students will discuss and analyze this.

3. The contents written in Dinosaurs Everywhere and Broken Sand and the order of interpretation adopted in relevant places.