Using LanguageⅡppt课件配套教案内容

Unit 2 Cloning

Period 4

Using language

Teaching Aims:

1.掌握以下单词和短语的拼写和用法：strike ...into one's heart、from time to time、

bring back to life、in vain、resist、merely、initial 2.通过运用略读和扫读两种阅读方法完成阅读任务；

3.通过本节课的学习，增进学生对克隆技术的了解，培养学生对科学的兴趣。

Step 1

Leading in

Look at the following pictures and think which film they are from. Do you like dinosaurs? Can you see them in our real life? Why? Step 2

Reading

Task 1

Skimming (match the main idea with each paragraph)

Part 1

A. Reasons for not cloning

Part 2

B. Possibility of cloning

Part 3

C. History of cloning

Part 4

D. Conclusion(结论) Task 2

Scanning

Division

Part 1

Part 2

Part 3

Detailed facts ♥

The idea ______ a mixture of fear and excitement into people’s hearts

♥

Scientists are still _________________ cloning mammals ♥

In the _____ research using the embryos of mice

♥

In 1996 first clone of a ________ :Dolly the sheep ♥

In 2000 cow _____________ a bison

♥___________________ people suggest that extinct animals can be ____________________ through cloning ,but it’s impossible or unsuitable(不合适的) .There are many reasons

: ♥

The ______ requirement(要求) is that you need perfect DNA.

♥

All efforts of cloning an animal will be ________ if there is not enough diversity(多样性) in the group to overcome(战胜，克服) illnesses. ♥It would be unfair to clone any extinct animals if they were to live in a zoo . ♥So the chance of dinosaurs ever returning to the earth is ________ a dream.

Part 4

Task 3

Choose the best answer：

1. The film Jurassic Park is popular because _______ .[Part 1]

A. people are interested in the subject of cloning extinct animals

B. all the actors are dinosaurs

C. it was directed by a scientist who clones dinosaurs

D. it proves very interesting 2. Which of the following is true?[Part 2]

A. Mice were cloned in 1981.

B. Dolly the sheep was the first cloned animal.

C. The name of the cloned cow is “Bison”. D. China was successful in cloning mammals.

3. The writer of the text _____.[Part 3]

A. is excited by the possibility of cloning fierce(凶猛的) and extinct animals

B. believes that extinct animals can be brought back to life by cloning

C. thinks it either impossible or unsuitable to clone extinct animals

D. dreams of dinosaurs returning to the earth 4. We can infer(推断) from the text that___.[Part 4]

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 years Step 3 Language Points 1. strike

vt. & vi. 打；撞击；罢工

n.罢工

教材原句

...proves how the idea struck a mixture of fear and excitement into people's hearts. strike作动词讲，还有其他含义吗？

【用法归纳】

2.from time to time 不时；偶尔

教材原句

From time to time people suggest that extinct animals like dinosaurs, can possibly be brought back to

life through cloning. 【"不时，偶尔"的多种表达方式】

你还记得有关time的常用习语吗？

3.bring back to

life使复生，使复活

教材原句

From time to time people suggest that extinct animals like dinosaurs, can possibly be brought back to life through cloning. 【用法指津】

【bring短语归纳】

4.in vain白费力气，枉费心机

教材原句

All efforts of cloning an animal will be in vain if there is not enough diversity in the group to overcome illnesses.

【"in +adj."类介词短语】

5.resist vt.抵抗；对抗

教材原句

...but others will survive and pass on the ability to resist

that disease to the next generation. 【用法指津】

【单词积累】

Step 4

Game Time Let’s play a game. Which is the best group?

Step 5

Practice Fill in the blanks with the phrases given.

in vain

bring back to life

from time to time

strike... into one’s heart(s) 1. Our teacher _____ the importance of safety _______________, so we were all careful when crossing the street. 2. My uncle comes to have dinner with us

________________. 3. I'm afraid that your efforts are _______;

he wouldn't listen to others. 4. His mother died last year. He wished he could ____her __________ . Step 6 Homework 1.Review the words and language points we have learned in this class. 2.Read more articles about cloning and the natural world.

Reading comprehension:

Research advances over the past decade have told us that, with a little work, we human can clone just about anything we want, from frogs to monkeys and probably even ourselves! So, we can clone things, but why would we want to?

Of all the reasons, cloning for medical purposes has the most potential to benefit large numbers of people. How might cloning be used in medicine? 1. Cloning animal models of disease Much of what researchers learn about human disease comes from studying animal models such as mice. Often, animal models are genetically engineered to carry disease-causing mutations(变异) in their genes. Creating these transgenic(转基因的)animals is a time-intensive process that requires trial-and-error and several generations of breeding(培育). Cloning technologies might reduce the time needed to make a transgenic animal model, and the result would be a population of genetically identical animals for study. 2. Cloning stem cells(干细胞) for the treatment of diseases Stem cells are the body's building blocks, responsible for developing and repairing the body throughout life. As a result, they might be used to repair damaged or diseased organs and tissues. Researchers are currently looking up cloning as a way to create certain human stem cells for the research of diseases.

3. Cloning farm animals for drug production Farm animals such as cows, sheep and goats are currently being genetically engineered to produce drugs or proteins that are useful in medicine. Just like creating animal models of disease, cloning might be a faster way to produce large herds of genetically engineered animals.

1. From Purpose One, we can infer that _____. A．most transgenic animals are clone B．most animals carry engineered genes C．most transgenic animal models are not cloned D．most animals carry disease-causing mutations in their genes 2. It can be learned from Purpose Two that cloning technologies can be mainly used to____ . A．create damaged or diseased organs and tissues B．clone genetically defined human stem cells C．develop and maintain the body D．repair the body throughout life 3. According to Purpose Three, cloning technologies can be mainly used to____.

A．speed up the producing of genetically engineered animals B．produce drugs or proteins that are useful in medicine C．raise genetically engineered cows, sheep and goats D．produce large herds of animals for human beings