高一英語必修3 Unit 4教案
2. ask ss to work in pairs and discuss the questions of ex1 on p27. and then let them check the answers in pairs.
step 3. intensive reading
purpose: to get the students to learn the details of the text.
(1) answer the questions:
• when did the “big bang” happen?
• what form was the earth the “big bang”?
• what made up the earth’s atmosphere after the earth exploded?
• how did water come into being on the earth?
• what was important to the development of fish?
• what made possible the rise of mammals on the earth?
• why are mammals different from all life forms in the past?
（2）fill in the chart about the order of development of life.
suggested answers:
① small plants in water ② shellfish and all sorts of fish ③ green plants on land
④ insects(on land) ⑤ amphibians(on land and in water) ⑥ forests ⑦ reptiles(on land)
⑧ dinosaurs(on land) ⑨ mammals(on land) ⑩ human beings
period 3 learning about language
teaching goals:
1. to get ss to know how to use new words and phrases.
2. to help ss to master some new words and expressions.
3. to get ss to have the knowledge of this grammar point: noun clauses as the subject
teaching procedures:
step 1. consolidation
purpose: to consolidate the words and phrases in the text.
1. ask ss to work in groups and read the text again, and then finish ex1 and ex2 on p28 and check the answers in groups.
2. ask ss to keep the words they filled in ex1 in heart.
3. ask ss to finish ex3 and then let them check each other’s answers.
step 2. grammar
purpose: to get ss to recognize noun clauses as the subject and to make sure that they can do some simple exercises.
1. divide ss into four groups and ask them to finish ex1 of discovering useful structures on p29. and then let them draw a conclusion about the grammar point. see which group understand it best and have a member of the group present before the class.
2. after the presentation, explain the grammar point for ss.
3.let ss complete ex2 on page 29 after learning the grammar.
purpose: to get ss to understand the usage of noun clauses as the subject.