课件16张PPT。Unit2 Using LanguageStep 1 Lead in:1. What animals do you see in the film?
2. Do you like dinosaurs? Can you see them in our real life? Why?
3. Do you think it is possible to clone dinosaurs? If not, why? If yes, do you think that’s good for human beings? Why?Enjoy a short movie and answer the questions.The return of the dinosaurs ?Learning aims:To show opinions about cloning the extinct animals.
To write an article based on ideas.
To learn how to organize a passage and how to write a short composition.
To learn the determination of solving the difficult problems.Arrange according to time.5. research using the embryos of mice
4. first experimental clones of cows
8. first experimental clones of mice
7. work on the embryos of sheep and mice
2. China’s first cloned twin calves
3. cloning of frogs
6. first clone of a mammal
1. cow gave birth to a bison3 5 7 8 4 6 1 2Step 2 Skimming:Step 3 Careful reading and answer:Why shouldn’t you clone an extinct animal unless there is enough diversity in the group?
Why is it wrong to clone an extinct animal if it would have to live in a zoo?
Give some reasons why it is either impossible or unsuitable to clone extinct animals.Why shouldn’t you clone an extinct animal unless there is enough diversity in the group?
There will not be enough genetic variation in the group to be able to resist new illnesses.Step 3 Careful reading and answer:2. Why is it wrong to clone an extinct animal if it would have to live in a zoo?
It is not a good idea to clone an animal that would have to live in a zoo because it is not a suitable habitat to develop and increase its numbers.The zoo is not a natural environment for a wild animal.
Step 3 Careful reading and answer:3. Give some reasons why it is either impossible
or unsuitable to clone extinct animals.Reason 1:
Reason 2:
Reason 3:You need perfect DNA.
There is not enough diversity for
cloned animals to overcome new
diseases.
It would be unfair to clone any
extinct animals if they would have
to live in a zoo.Step 3 Careful reading and answer:1.The writer of the text _____.
A. is excited by the possibility of cloning fierce and
extinct animals
B. believes that extinct animals can be brought
back to life by cloning
C. thinks it impossible or unsuitable to clone
extinct animals like dinosaurs
D. dreams of dinosaurs returning to the
earthStep 4 Comprehending: C 2. The film Jurassic Park is popular
because _______ .
A. people are interested in the subject of cloning
B. all the actors are dinosaurs
C. it was directed by a scientist who clones
dinosaurs
D. it proves very interestingA Step 4 Comprehending: 3. The reasons why a group of cloned animals all die
of the same illness do NOT include ____.
A. they have the same arrangement of genes
B. there isn’t enough diversity in the group for it
to overcome illnesses
C. the illness is a new one
D. their arrangement of genes can not resist that
new diseaseC Step 4 Comprehending: 4. We can infer from the text that ____.
A. scientists are experimenting to clone dinosaurs
B. dinosaurs will never return to the earth
C. cloned animals will only live in the zoo
D. the DNA of dinosaurs can only survive 10, 000
yearsB Step 4 Comprehending: What do you think of cloning?
Is it good or bad for us? Step 5 Discussion:写作任务: My opinion on cloning
写作要求: 注意记叙文的表达方式;
要写明白自己的观点, 层次要分明。
写作建议: 本单元主要讲述了“cloning”存在的问
题以及人们的态度, 文中可适当就此进行发挥。Step 6 Writing: 1. Read the passage again.
2. Finish the composition.
3. Underline the difficult sentences.
Step 7 Homework: