Natural clone is one that occurs in a

Natural clone is one that occurs in a natural form of cloning without human help. Man-made clone is one that produced through human intervention(介入).

Discussion In pairs, look at these pictures and discuss which ones are natural clones and which ones are manmade. Explain how they differ.

A strawberry plant

Growing new plants

Twins

Dolly the sheep How does Dolly differ from other sheep? She was cloned while the others were born naturally. cloned sheep. Dolly was a ______

1996 cloning sheeps

2001 cloning cattle

2002 cloning cats

2005 cloning dogs

富贵竹插枝即活 The gardener should cut the plant , then the cutting produce another new plant.

Twins They are born naturally and identical in sex and appearance.

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

Pre-reading How is a clone produced? The cloning of plants is simple and relatively easy. It can be done by taking cuttings (man-made cloning) or letting the plant produce its own runners(natural cloning). The cloning of animals is more complicated. It was not achieved until 1996 and is fully explained in the first reading.

Pre-reading What benefits can humans gain from cloning? Medical cloning can help cure serious illneses that ruin one’s quality of life. It can help infertile people have babies.

Pre-reading What problems may arise when humans are cloned? People may want to clone themselves so they can live forever. People may want to clone dead children. People may want to clone their favourite pets

Listening T or F questions 1 Clone can be from both natural clone and man-made clone. T 2 The sheep, named Kitty was the first successful clone of a mammal(哺乳动物). F 3 Only strawberries and cactus(仙人 掌) are natural clones. F

4 Since Dolley , researcher have cloned a number of large and small animals including goats , cows , mice , pigs, cats, rabbits and dogs. T 5 A parent can clone a child who is dying of a terminal illness ( 不治之症). F

skimming What’s the text mainly about? It’s mainly about cloning arguments about animal cloning and concerns About its future.

Do you know about: The procedure works of a sheep?

Para 1 The definition of cloning plants and It happens both in ______ animals They can be cloned in_______. themselves and _______. humans by ____ Natural clone Man-made clone What is cloning ? Cloning is a way of making an exact copy of another animal and plant.

Para 2 The major uses and procedures of cloning 1. How many major uses do cloning have? Firstly, …commercial… Secondly, …research… 2. When was the cloning of Dolly the sheep born? 1996

Para 3 The problems of Dolly normally At first, the fact that Dolly developed ______ encouraging was _____. that Later, the news _____she lived for six years, orginal one half the length of the life of the ______ disturbing was _____. Finally, a cloned animal lives _______ the original one. shorter than as long as / shorter than / longer than

Para 4 The impact of Dolly The word “controversial” in para 4 probably means ______. A. complicated B. arguable C. important

Para 5 People’s reaction to cloning True or false: 1 People feared that Cloned Hitlers would do harm to the world. Many governments forbade reserch 2 All the research into human beings will into human beings. be forbidden. 3 Some countries will use cloning in a wise way.

The writer’s attitude towards cloning A. Objective (be fair) B. Negative (be against it) C. Positive (be in favor of it) the author does not state Because______________ any personal opinion about cloning. ___________________

Careful reading fill in the chart using the information from the text. Add one reason of your own in each column.

Problems or dangers Advantages of cloning Animal clones may Medical cloning develop the illness could produce cures of older animals. for serious degenerative illnesses in humans. Animal clones may Cloning plants can die younger than the produce plants of donor animals similar quality for sale

Problems or dangers of cloning Advantages of cloning Evil leaders may want to clone themselves Cloning plants can be useful for research on new plant species. There are moral objections to cloning human beings Cloning can help save endangered animals.

Post-reading 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.

2. Which of the following statements about cloning is NOT true according to text? A. Cloning is something that has been developed quite recently. B. Twins that look exactly the same are originally from the same egg. C. Cloning is used by gardeners to make more money. D. Animal cloning is much more difficult than plant cloning.

3. 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

4. The lamb is the clone of the cell from sheep because_____. A. it provides the egg cell B. it gives birth to the lamb C. it provides the nucleus D. it is a female sheep

5. The sheep that donated the somatic cell most probably lived ____ years. A. 3 B. 6 C. 9 D. 12