dinosaurs

Jurassic Park

Do you think it is possible to clone dinosaurs?

The Return of the Dinosaurs?

Skimming: What’s the writing style of the text? A. exposition B. argumentation C. narration D. essay

The organization of an argumentative passage

1. Put forward a question

2. Analyze the reasons and solve the problem

3. Draw a conclusion

Three parts

part 1

part 2

part 3

The title and part I--- put forward a question1.Which question is put forward?

2.What kind of feeling does the idea of cloning extinct animals give people?

3.What’s the present situation of cloning? Why?

Can we clone extinct animals?/ Is it possible to clone extinct animals?( the possibility of cloning fierce and extinct wild animals)

2. The popularity of films such as Jurassic Park, in which a scientist clones several kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into people’s hearts. (translation)

2. 在《侏罗纪公园》这部影片中，有一位科学家克隆了几种不同的灭绝的恐龙，类似这样的影片很受欢迎，证明了 (克隆灭绝动物 )这一想法使人们感到既兴奋又恐惧。

We are a long way from being able to clone extinct animals. Scientists are still experimenting with cloning mammals.

This is because the cloning of mammals is still a new science and…(PC) strike… into one’s heart: (formal) to make sb. feel…

Sentence patterns: This is because… That is why… The reason why… is that…

Part II--- solve the problem and analyze the reasons Solve the problem: It is either __________ or __________ to clone extinct animals like dinosaurs. Analyze the reasons:

The initial requirement: You need ______ DNAThere must be enough ________ in the group to overcome illnesses. The advantage is that if there is a new _______ some of these animals may ____, but others will survive and ____ ___ the ability to ______ that disease to the next generation.A suitable ______ would be needed for them to lead a _______life.

impossible

perfect diversity

habitat

illness pass on

resist

die

unsuitable

natural

1. Which sentence can be replaced by the following one?

2.What is the great drawback to cloning a group of animals?

3.Why would a suitable habitat be needed?Because a suitable habitat is important for them to develop and increase their numbers..

Careful-reading and thinking

There must be enough variety in the group to resist diseases, otherwise we will fail to clone an animal.All efforts of cloning an animal will be in vain if there is not enough diversity in the group to overcome illnesses.

Key words:sth be in vain — sb fail to do

diversity — variety overcome — resist

The great drawback is that they would all have the same arrangement of genes and so might die of the same illness.

disadvantage; weakness

Part III---draw a conclusion

Use the three reasons in part 2 and the information in part 3 to analyze why we couldn’t clone dinosaurs.

Pair-work

There is no perfect DNA. (We cannot clone animals that have been extinct longer than 10, 000 years. Dinosaurs disappeared 65,000,000 years ago.)

It is difficult to have enough diversity in the group to overcome illnesses.

There is not a suitable habitat.

Quagga (1883) Great Auk (1844)Great Auk (1844)

May the best animal win! Aurochs (1627) Dodo bird (1755)

Discussing and reporting

Choose one animal and use the information in the table and reasons in our text to help you argue why this animal is worth cloning.

Requirements:1. Choose a speaker and a note-taker;2. Follow the example of the report on page

17 but do not copy;3. You can use some linking words;4. Report loudly.

(We hold the opinion that) ______ is the most suitable animal to bring back to life. Here are the reasons/ benefits. (First of all,… Then,… In addition/ What’s more… Finally/At last…) So we think ______ would be the best choice to bring back to life.

the report 1. Anyway he was dead. We could not bring

him back to life.

2. His humorous speech brought his class back to life.

Let’s bring the dodo back to life

使……复活使……恢复生机 /活跃

1. It is too similar to the zebra to be worth the trouble of restoring it. （ translate）2. The dodo became extinct fairly recently so its DNA is still in good condition. (replace)

1. 它（白氏斑马）与斑马太相似而不值得费力去恢复 /复活。2. The dodo’s DNA is still in a good state because it died out quite recently.

because ---- so quite ---- fairly

die out ---- become extinct

in a good state ---- in good condition

1.We can’t clone extinct animals because of three reasons: (key words)

1) ____________

2) __________

3) __________

2. Sentence patterns

3. Some important words and phrases

Summary

perfect DNA

diversity

habitat 1) ____________

2) ____________

3) ________________________

This is because…

That is why…

The reason why… is that…

homework1.Complete your report on a

piece of paper and hand in.

2.Find out the noun clauses.

1. This is because…2. That is why…3. The reason why… is that…

1.He didn’t work hard. _________________ he failed in the exam.

2.He failed in the exam. ________________ he didn’t work hard.

3.________________ he failed in the exam ________ he didn’t work hard.

That was why

This was because

The reason why was that

The reason why… is because…

Practice: