人教版高一英语必修3第四单元(Book 3) Unit 4 学案含答案

广州市岭南中学

Unit 4 Astronomy: the science of the stars（Module 3） Period 1 Reading: How Life Began on The Earth

班级__________ 姓名____________ 学号 _____________

Learning Objectives:

1. Learn the useful new words and expressions in the reading material.

2. Improve the reading skills while reading the passage about the astronomy. Learning Key Points:

1. Grasp the important words and expressions in the reading material. 2. Learn something about how life began on the earth. Learning Difficult Points:

1. Grasp the important words and expressions. 2. Improve the reading ability. Learning Procedures:

I. 【Pre-class homework】

A. Match the main idea of each paragraph.

Para 1: ( ) A. The formation of the earth.

Para 2: ( ) B. A widely accepted theory about the information of the universe. Para 3; ( ) C. The arrival of humans and their impact on the earth. Para 4: ( ) D. The importance of water for life.

Para 5: ( ) E. The development of plants and animals on the earth.

B. Ask and answer.

1. What was there on the earth before life could begin?

___________________________________________________________________________

2. Why did animals first appear in the seas?

___________________________________________________________________________

___________________________________________________________________________

II. While-class Step 1 Lead-in

Step 2 Discussion

Ss discuss their pre-class homework in groups.

Step3 Consolidation

A. Further reading and finish the following comprehension questions. 1. ( ) What forms the earth’s atmosphere? A. Carbon dioxide, oxygen .

B. Carbon dioxide, oxygen, poisonous gas.

C. Water vapor, carbon dioxide, oxygen, nitrogen.

D. Water vapor, carbon dioxide, oxygen, nitrogen and other gases. 2. ( ) Why was the earth different from other planets?

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A. It produced a lot of heat. B. The water remained. C. Water disappeared. D. It was the oldest planet. 3. ( ) What kind of factor improved the progress of life? A. Water forms on the earth’s surface. B. Green plants began to appear on land. C. The air is full of carbon dioxide.

D. Animals began to appear such as insects, amphibians, est. 3. ( ) What is the main idea of this passage?

A. It tells us how life begins to appear on the earth. B. It tells us why green plants grow before animals.

C .It tells us water plays an important role in the development of life.

D. It tells us carbon dioxide is the reason why living beings will die in the future,

4. ( ) The author infers us that if we want the life to continue on the earth, what should we do?

A. We should produce more carbon dioxide to cause global warming. B. We should solve the problem of global warming as soon as possible.

C. We should bear less people and think about a new way to grow more crops. D. We should be worthy of water.

B. Cloze test.

At the very beginning, the earth was just a cloud of 1. ___________ (energy) dust. Then the dust combined 2. __________ a ball moving around the sun. After that, it exploded 3.______(loud) with fire and rock, 4. ___________ (produce) water vapor, carbon dioxide and other gases, 5. _____________ made 6. ____________ possible for life to begin to develop. Some small plants 7. ___________ (grow) in the water appeared on the earth’s surface, 8. _____________ (follow) by land animals, including insects, amphibians, reptiles and the dinosaurs. But they disappeared 9. ________ of a sudden and some small clever animals with hands and feet appeared and spread all over the earth and took the place of dinosaurs. They became 10. _______ most important animals on the planet — that is, human beings.

Step 4 Presenting

Ss present their group job.

1．Ss write down their answers on the blackboard and give the explanation in class.

2．Teacher and Ss’ comment.

Step 5 Summary

Ss talk about what they have learned in the lesson.

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