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Book 8 Unit 2 Cloning 课堂学案


Book 8 Unit 2 Cloning 课堂学案
教师寄语: There is only one good, that is knowledge; there is only one evil, that is ignorance. 唯一的善

1. Cloning has always been with us and is _________

___________ here to stay. 克隆一直与我 们同在,而且它还要持续下去。 Here to stay: will continue to exist for a long time and become accepted as normal. Misleading titles are very hard to abolish; they have come to stay. Are short dresses here to stay, or will fashion change again? It looks as if high unemployment is here to stay. 即时练习: 你也许不喜欢计算机,但是它们已经成为生活的一部分。 ___________________________________________________

是知识,唯一的恶是无知。
I. Check the results of previewing: 1. What is clone? 2. How many female sheep participate in the cloning of a new sheep? II. Careful reading 1. What’s the main idea of the text ? It’s mainly about animal cloning raised arguments and scientists are not sure about its future 2. Dolly the sheep_____. A. looked exactly like the sheep that provides the egg. B. was the exact copy of the sheep that provides the nucleus. C. looked like the sheep that gave birth to it. D. had the characteristics of all three sheep. 3. It can be inferred from the passage that a cloned animal_____. A. usually lives as long as the original one B. usually lives longer than the original one C. usually lives shorter than the original one D. is usually as healthy as the original one 4. Which of the following statements about cloning is NOT true according to the text?? A. Cloning is something that has been developed long before.? B. Dolly the sheep is the first successfully cloned animal. C. Cloning is used by gardeners to make more money.?
D. Animal cloning is much more difficult than plant cloning.?

1. Cloning plants is straightforward while cloning animals is very complicated. 2. But at last the determination and patience of scientists paid off in 1996 with a breakthrough. 3. Cloning scientists were cast down to find that Dolly’ illnesses were more appropriate to a much older animal. 4. On the other hand, Dolly’s appearance raised a storm of objections and had a great impact on the media and public imagination. 5. It suddenly opened everybody’s eyes to the possibility of using cloning to cure serious illnesses and even to produce human beings. 6. Although at present human egg cells and embryos needed for cloning research are difficult to obtain. 7. However, scientists still wonder whether cloning will help us or harm us and where it is leading us.

2. Terms relevant to clone: original egg 原生卵子 somatic cell 躯干细胞 3. 检测与反馈 Practice: egg cell 卵细胞 embryo 胚胎 nucleus 细胞核 donated cell 供体细胞

5. What’s the writer’s attitude towards cloning? Why?

(通过课堂活动完成) (5m)

Retell the procedure of cloning Dolly the sheep?

III. Important sentences:

Put the statements in right order to show the procedure of cloning a sheep.

1. an egg cell without nucleus 2. an embryo 3. The nucleus from my loved sheep and the egg cell from a friendly sheep are joined using electricity. 4. a somatic cell 5. the nucleus taken out of the somatic cell A friendly sheep an egg cell My loved sheep

课后延伸拓展 Write a passage with the title “Clone--- good or bad?” with about 120 words.

_______________________________________________________________________________ _______________________________________________________________________________

A cloned sheep

carrier _______________________________________________________________________________

拓展与升华 (课堂完成) (10m) IV. Fill in the chart using the information from the text and your imagination. Problems or dangers of cloning Advantages of cloning

_______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________

From the text

Your imagination

_______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________

V.当堂检测 1. The naughty boy______________________________ (被禁止离开教室) as a punishment. 2. He___________________________(非常沮丧) by the failure of the experiment. 3. The task_____________________________(很难承担). (undertake) 4. Drugs__________________________________(对青少年有很大影响).(impact)


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