Reading

Where is it leading us?

Book 8 unit 2

Natural clone is one that occurs in a natural form of cloning without human help. Man-made clone is one that is

produced through human

intervention( 介入 ) .

Warming up

Two kinds of clones:

In pairs, look at these pictures and

discuss which ones are natural

clones and which ones are man-

made. Explain how they differ.

Discussion

A strawberry plant

The new plants that grow from the runners are exact copies of the original plant.

Growing new plants

富贵竹插枝即活

The gardener cuts the plant ,and then the cutting produces another new plant.

Twins

They are born naturally and identical in sex and appearance.

She was cloned while the others were born naturally.

Dolly was a ______ sheep.cloned

How does Dolly differ from other sheep?

In 1996, a sheep called Dolly was born. It is the first mammal to be cloned. It is considered to be the greatest success in the development of cloning.

The following are some photos

about cloning. See how much

you know about it.

2001 cloning cattle

2003 Cloning horse2002 cloning rabbits

2002 cloning cats

2005 cloning dogs克隆的荧光小猪 ( 左 ) 和正常小猪 ( 右 )

Skimming

Please read the passage quickly

and get the main idea, and then

finish the following exercises in

groups.

Please read the passage quickly

and get the main idea, and then

finish the following exercises in

groups.

1. The main idea of the text is____

A. animal cloning is very valuable and can benefit the world.

B. animal cloning could be misused by bad people so it must be forbidden

C. animal cloning is well developed because Dolly the sheep was born.

D. animal cloning raised arguments and scientists are not sure about its future.

主旨大意

2. The cloning of Dolly the sheep succeeded because____. A. its easier to clone a sheep than other animals B. the scientists were determined and worked hard with patience

C. the scientists were rewarded and got lots of money

D. many other attempts to clone mammals failed

B

细枝末节

3. What is people's fear about human

cloning. Which of the following is wrong?

A. Cloned Hitlers would do harm to the

world.

B. Cloned people may be killed at will for

medical aid.C. A woman would have difficulty

recognizing her real husband.D. Men will die out because a woman can give birth to a baby without a husband.

4. The sheep that donated the somatic

cell most probably lived ____ years.

A. 3 B. 6 C. 9 D. 13

推理判断

5. We can infer from the last three paragraphs that ___.A. The normal development of Dolly had no effect on the cloning of other species.B. Dolly’s serious disease and final death disturbed the whole world.C. There were arguments about anima

l cloning and concerns about the future of cloning.

D. Dolly successfully cloned a new lamb with the help of cloning scientists.

Reading

Listen to the tape and fi

nd out the main idea of e

ach paragraph.

listening

The main idea of each paragraph.

a way of making an exact copy of another animal and plant.

problems

two major

effect

1.Cloning is ______________________________

2.Cloning has ____________ uses.

3.The _________ of Dolly.

4. The ________ of Dolly.

5. People’s to cloning.reaction

Cloning is a way of making an exact copy of another animal and plant.

What is cloning ?

It happens both in ______ and in_______. They can be cloned by ________ and _______.

plantsanimalsthemselves humans

Natural clone Man-made clone

Para 1 The definition of cloning

Firstly, …commercial… Secondly, …research…

Para 2 The major uses and procedures of cloning

In this paragraph, the word

“straightforward” means ____.

A. uncomplicated B. honest

C. frank D.

difficult

At first, the fact that Dolly developed ______ in a natural way was __________.

Later, the news _____Dolly had become seriously ill was __________.

Finally, the problem that occurred to the scientists was that a cloned animal lives_____________ the original one.

Para 3 The problems of Dollynormally

encouraging

that

as long as / shorter than / longer than

disturbing

shorter than

The word “controversial” in para 4 probably means :____________.

A. complicated

B. arguable

C. important

D. traditional

Para 4 The impact of Dolly

Its’ appearance raised and the media and public imagination.

a storm of objectionshad a great impact on

True or false:

1 People feared that Cloned

Hitlers would do harm to the world.

2 All the research into human beings will be forbidden.

3 Some countries will use cloning in a wise way.

Para 5 People’s reaction to cloning

Many governments forbade research into human beings.

the author does not state a

ny personal opinion about cloning.

A. Objective (be fair)

B. Negative (be against it)

C. Positive (be in favor of it)

The writer’s attitude towards cloning

Because____________________________

_____________________________________

Fill in the chart about the advantages and disad

vantages of cloning.

Advantage(good points) Disadvantage(bad points)

Collecting information

Cloning is beneficial to

It can make more profits for

We could use cloning to cure

Cloning can help save

Cloning can provide a copy of a child for a couple

Animals clones get ill and

Against nature

Animals clones may develop the illness of

Evil leaders may want to

People are afraid that scientists will create thousands of copies of the same person.

gardeners and farmers

endangered animals

whose child has died

die young

older animals

clone themselves

illness

humans

Practice activity: Debate

Are you in favor of cloning or against cloning? State your point

of view on it.

ＶＳFor Against

Homework : 基础写作写作情景：今天我们班同学讨论了有关克隆的问题。

同学们热烈发表了评论和表达了自己的看法；他们主要有两种不同的意见：

写作内容： 支持者认为克隆利大于弊，克隆技术是 21 世纪人类

科学的伟大突破。人类可以利用克隆技术培养大量品质优良的动植物；挽救珍奇濒危动物；调节大自然的生态平衡；可以研制高水平新药解决人类各种疾病等。

反对者认为克隆会导致动物早衰、夭折；无计划的克隆动物会破坏生态平衡，导致一些疾病的传播 ; 邪恶分子可能克隆自己，给人类带来灾难等。

写作要求：使用五个句子表达全部内容

Wish you good luck and success ahead!