Using LanguageⅠ名师教学设计2

UNIT 4

How Life Began on the Earth.

The Sceond Period Intensive Reading

Teaching goals ：

1. Target language：

theory, atom, billion, globe, violent, carbon, atmosphere, fundamental, harmful, acid, multiply, oxygen, exist, prevent, dioxide 2. Ability goals：a. Enable Ss to talk about the science of the stars, the development of life and space travel and gravity. b. Understand the text and answer the following questions c. Enable the Ss to understand the details about the passage, choosing the correct answer according to the text and put the order of development of life into a time line and answer questions. d. Retell the passage using key sentences. Teaching methods：

a. Skimming and scanning. b. Asking-and-answering activity to check the Ss’ understanding of the text. c. Individual, pair or group work to finish each task. Step1:Lead-in :Listen to the

song YOU AND ME by Liuhuan and Sarah Brightman

together ,ask students to say something about our earth ,get them understand that we have only one earth ,it’s highly suggested that we should protect our earth.

Step2: Scanning：Read the passage quickly and answer the questions. 1. When did the “Big Bang” happen?

2. What form was the earth after the “Big Bang”?

3. What made up the earth’s atmosphere after the earth exploded?

4. How did water come into being on the earth? 5. What’s the significance of the presence of water on the earth? 6. What was important to the development of fish? 7. What made possible the rise of mammals on the earth? 8. Why are mammals different from all life forms in the past? Step3:Finish the Exercise 2 onP27 according to the questions above.

Step4: Read the passage carefully and match the main idea with each paragraph.

Para. 1

The formation (形成) of the earth. Para. 2

The importance of water for life. Para. 3

A widely accepted theory about the formation of the universe. Para. 4

The arrival of humans and their impact on the earth.

Para. 5

The development of plants and animals on the earth.

Step5:. Finish the Exercise 3 on P27. Step 6: Group competitions. Listen to the tape for the students to follow and have further understanding of the passage. A. True (T) or False

(F).(show them on the screen )

B. Fill in the blanks in the following form. Time Big Bang What happened ___1___ began to form and

combine to create stars

and other bodies. Between 4.5 and 3.8 ●Dust settled into a solid and ___2___ globe. billion years ago ●The earth exploded to produce its ______3_____.●The continued _____4___ of water allowed the earth to dissolve harmful gases and ___5__ into the oceans and seas. Many millions of ●The first small plants on the surface of the water produced ___6___. ●Early ___7____ and all sorts of fish appeared.●Green plants began to grow on land. ●Insects and _____8_____ appeared. Many millions of ●___9____ appeared and they laid eggs. ●Dinosaurs developed, laid eggs and __10____ for more than 140 million years. ●Mammals rose and

____11________ babies. About 2.6 million ●Some small __12____ animals with hands and feet appeared and spread all over the earth. Now Humans produce too much carbon __13_____, making the earth too hot. years later years later years ago

Step 7. Summary Last month I visited the moon with my friends. Before we left, I was told the force of g_____would change three times on our journey.Then we were off.As the rocket r

into the air, we were back into our seats . Gradually the weight l______. When I was in space, it d_________. We f______ weightlessly in the cabin and I c_____

. When

I was on the moon. I was surprised to find out even walking needs lots of practice n___

gravity changed . The returning of the earth was very f________.

We were amazed to watch fire b____

on the outside of the ship.

Step 8:

课堂自我检测：

1．太阳系

2．及时，总有一天

3．阻止，制止

4．依靠，信赖

5．感到高兴

6．既然，由于

7．一般而言

8．熟悉，掌握

9．突发，爆发

10．与…不同

11．冷却

12．全球变暖

13．二氧化碳

14. 在表面上

15. 好象

16下蛋

17.结果

18接着，轮到某人

19.产生，分娩

20 一团尘埃

Step9: Homework A. What should we do for our earth?phrases to help you: prevent… from… harmful

global warming carbon dioxide

in turn

depend on

as a result

thus

atmosphere B. How life began on earth is one of the biggest puzzles that scientists found hard to solve. What other puzzles are hidden in the passage? Find them out and do some research.

You can use the following words or