Unit4 Astronomy 教案

T eaching Plan For Unit 4
The 1st Period
Teaching Procedures
The 1st Period
Step 1 Warming up
1. Warming up by looking and talking
2. Deal with some new words，expressions
3. get to know about the universe.
Step 2 Fast-reading
Task1:Sum up the main idea of each paragraph according to the given key words or key sentences
Main Body
Before life
appeared
Paragraph 1: A widely accepted theory about the formation of the
universe
Paragraph 2: The formation of the earth
Different
lives
developed
Paragraph 3: The importance of water for life
Paragraph 4: The development of plants and animals on the earth
Paragraph 5: The arrival of humans and their impact on the earth
Task2. Get familiar with the passage by answering some questions.
Read paragraph 1 to paragraph 3:
1.According to a widely accepted theory, how did the stars form?
2.How did the earth’s atmosphere form?
3.Why was the earth different from the other planets?
4.What a role the water played in the development of life?
Read paragraph 4 to 5:
1.What a role the small plants played in the development of life?
2.How did the reptiles and dinosaurs produce the young?
3.Why were mammals different from all life forms in the past?
4.What human activities have a bad effect on the earth?
Task3 Make a timeline:
1.How did the earth come into being?
2. Make a timeline of the development of life
meanwhile , show the pictures of the development of life.
Step 3 Detailed reading
1. Review how life develop and how life began on earth.
2. Answer the following questions according to the text.
(1).What was produced when the earth exploded?
carbon dioxide, oxygen, nitrogen water vapour and other gases.
(2).How did water come into being on the earth?
The explosion of the earth produced water vapor, which turned into water when the earth cooled down.
(3). Where did life first begin, on the land or in the sea?
In the sea. Because water dissolved harmful gases and made it possible for life to begin.
(4). Why were mammals different from other animals?
Because they gave birth to young baby animals and produced milk to feed them. (produced their young from within their bodies).
2.Multiple choice exercises.
(1)Why was the earth different from other planets?
A it produced a lot of heat. B. The water remained.
C Water disappeared. D. It was the oldest planet.
(2)Why was life able to develop on the earth but not on other planets?
A The earth had a solid shape.
B. The earth did not have harmful gases in its atmosphere.
C The water stayed on the earth but not on other planets.
D.The earth was not too hot and not too cold.
(3).Why was it necessary for plants to grow before animals?
A Animals needed plants to protect them from the sun.
B Plants provided oxygen for animals to breathe.
C Animals could hide from hunters in forest.
D It was easier for plants to grow.
(4).What problem is caused by human being?
A They exist everywhere on the earth.
B They cause global warming.
C They find new methods of growing crops.
D They enjoy hunting and fishing.
3.Put the order of development of life into a timeline. (ex.2 on page 27)
Step4. Discussion
1.What problems have been caused by humans to the earth?
2.How to protect the earth and make it a better place to live on? Step5.Home work
Review the reading materials.
Find out the beautiful sentences in this unit.。