人教新课标英语选修八课件:Unit2 Reading
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1、Reading,Unit 2 Cloning,In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.,Warming up,Dolly the sheep,Its the most famous sheep in the world. Do you know how Dolly is different from other sheep?,man-made clones,She was
2、cloned while the others were born naturally. It is the copy of another sheep.,What can you see in the picture?,I can see a strawberry plant producing runners in a natural form of cloning.,natural clones,Who cut the stem off the plant?,A gardener. The gardener is going to put it into a pot to produce
3、 another plant. He is actually making a copy of the plant.,man-made clones,What do you know about twins?,natural clones,There are twins of the same sex and those of different sexes. The twins here are identical in sex and appearance and are good examples of natural clones. They carry the same geneti
4、c information. The fertilized egg has split into two while inside the mother, and so produced two identical human babies.,Are the following clones the same? If not, what is the difference?,No. The first two are man-made clones.,The rest two are natural clones.,Questions about cloning:,1. What is a c
5、lone?,A clone is an animal or plant produced naturally or artificially from the cells of another animal or plant and is exactly the same as it.,2. 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 p
6、roduce 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.,3. What benefits can humans gain from cloning?,1) Medical cloning can help cure serious illnesses that ruin ones quality of life (such as
7、Parkinsons disease帕金森症 or Alzheimers disease老年痴呆症). 2) It can help infertile people have babies.,4. What problems may arise when humans are cloned?,1) People may want to clone themselves so they can live forever. 2) People may want to clone dead children. 3) People may want to clone their favorite p
8、ets.,The text is mainly about the 1. _ of animal cloning and the life of Dolly the sheep, as well as the reasons why cloning is still 2. _.,controversial,procedure,Read the text quickly and complete its main idea.,Read through the passage and find the main idea of each paragraph.,Cloning is a way of
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