Unit 4 Astronomy:
4. deal with the difficult sentence.
what made the earth’s atmosphere?
they were in time to produce carbon, nitrogen, water vapour and other gases, which were to make the earth’s atmosphere.
paragraph 3
ask the students to read paragraph 3 to understand the importance of water.
1. ask the students to tell whether the following sentences are true or false.
( f ) water on the earth disappeared later.
( t ) water was necessary and important to the development of life.
( t ) water was helpful in dissolving the harmful gases and acids into the oceans and seas.
2. help the students understand the importance of water.
q: what facts can show us the importance of water?
paragraph 4-5:
ask the students to read paragraph 4-5 to understand the development of life.
1. ask the students to read the two paragraphs quickly. underline the time and the names of different plants and animals mentioned in the two paragraphs.
millions of years later; next; later; after that; 65 million years ago; 2.6 million years ago;
small plants; shellfish and fishes; green plants; land animals; insects; amphibians; forest; reptiles; dinosaurs; mammals; clever animals;
2. check the answers in class.
3. ask the students to discuss in groups to find the development of life and draw a mind map to show it.
plants animals
3. ask some groups to show their mind map in class and give a general explanation.
step 3 post reading:
1. remind the students of the title and the clue of the passage once again.
point out the style of the passage: exposition
2. allow the students 3 minutes to prepare the retelling and then ask one or two students to retell the development of life with their own words.
(this part will be left as homework if there is not enough time.)
homework:
1. retell the development of life. pay attention to the conjunctions.
2. explain the difficult sentences. (劃出主句，指出從句的種類，并翻譯中文)
1) what it was to become was uncertain until between ……a solid globe.
2) the earth became so violent that it was not clear ……with fire and rock.