book8-unit2-reading

1、Unit2 In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.Dolly the sheepIts the most famous sheep in the world. Do you know how Dolly is different from other sheep?She was cloned while the others were born naturally. It

2、 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.Who cut the stem off the plant?A gardener. And the gardener is going to put it into a pot to produce another plant. He is actually making a copy of the plant.What

3、 do you know about twins?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 genetic information. The fertilized egg has split into two while inside the mother, and so produced t

4、wo identical human babies.Pre-readingQuestions about cloning:1. What is a clone?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

5、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.3. What benefits can humans gain from cloning?1) Medical cloning ca

6、n help cure serious illnesses that ruin ones quality of life (such as Parkinsons disease帕金森症帕金森症 or Alzheimers disease老年痴呆症老年痴呆症).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 ma

7、y want to clone dead children.3) People may want to clone their favorite pets.ReadingReading Listen to the tape and find out the main idea of each paragraph.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

8、 _.plantsanimalsthemselveshumansNatural cloneMan-made clonePara 1 The definition of cloning1.How many major uses do cloning have? Firstly, commercial Secondly, research2. When was the cloning of Dolly the sheep born?Para 21996The major uses and procedures of cloningAt first, the fact that Dolly deve

9、loped _ in a natural way was _.Later, the news _she lived for six years, half the length of the life of the _ one was _.Finally, the problem that occurred to the scientists was that a cloned animal lives_ the original one.Para 3The problems of Dollynormallyencouragingorginalthatas long as / shorter

10、than / longer thandisturbingshorter thanThe word “controversial” in para 4 probably means _. A. complicated B. arguable C. importantPara 4The impact of DollyTrue 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 coun

11、tries will use cloning in a wise way.Para 5 Peoples reaction to cloningMany governments forbade reserch into human beings.II. Read the text carefully and fill in the blanks.DefinitionCloning is a way of making _ of another animal and plant.Major uses of cloning Gardeners use it to _ commercial quant

12、ities of plants. It is valuable for research on new plant species and for _ research on animals.an exact copyproducemedicalAbout Dolly the sheep Encouraging news: Dolly seemed to develop _. Disturbing news: Dolly lived only six and a half years, half the length of the life of the _ sheep, because of

13、 serious illnesses which were more appropriate to a _.normallyoriginalmuch older animalDifferent opinions on cloning Evil leaders hoped to clone _ to attain their ambitions. Religious leaders raised _ questions. Some governments _ research into human cloning but other countries like China and the UK

14、, continued to accumulate _ of the abundant medical aid that cloning could provide.themselvesmoralforbadeevidence1). 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

15、is well developed because Dolly the sheep was born. D. animal cloning raised arguments and scientists are not sure about its future.III. Choose the best answer after reading the passage again.2). Which of the following statements about cloning is NOT true according to text? _ A. Cloning is something

16、 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.细枝末节细枝末节A3). The cloning of Dolly the sheep succeeded because_. A. its easier

17、 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 failedB4). The lamb is the clone of the cell from sheep because_. A. it provides the egg cell B. it gives

18、 birth to the lamb C. it provides the nucleus D. it is a female sheep5). Dolly the sheepA. looked exactly like the sheep that provides the eggB. was the exact copy of the sheep that provides the nucleusC. looked like the sheep that gave birth to itD. had the characteristics of all three sheep6). It

19、can be inferred from the passage that a cloned animal.A.usually lives as long as the original oneB. usually lives longer than the original oneC. usually dies earlier than the original oneD. is usually as healthy as the original one7). Which of the following is wrong?A. Cloned people would live forev

20、er.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.8). The sheep that donated the somatic cell most probably lived _ years. A. 3 B. 6 C. 12 D. 13推理判断推理判

21、断9). Which of the follow is NOT a problem or danger of cloning mentioned in the text?A. Evil leaders may want to clone themselves.B. Animal clones may develop the illness of older animals and may die younger than the donor animals.C. There are moral objections to cloning human beings.D. Too much clo

22、ning may lead to the destruction of the balance of nature.10). Which of the following is not an advantage of cloning?A. Cloning can be used for medical purposes.B. Large quantities of food can be produced by cloning.C. Famous persons who have passed away can be cloned.D. Cloning can help keep animal

23、s from becoming extinct.11). In the second paragraph, the word “straightforward” means _.A. uncomplicated B. honest C. frank D. difficult12). From the last paragraph we can infer that _.A. cloning will come to an end because of the objectionsB. cloned human beings will be produced in the near future

24、C. many countries will use cloning in a wise wayD. all the research into human beings will be forbiddenC13). What about the writers attitude toward cloning in this passage?A. The writer is against cloning.B. The writer is in favor of cloning.C. The writer does not state any personal opinion about cl

25、oning.D. The writer is in agreement with cloning.Do you know about: the procedure works of a sheep? 克隆羊诞生图示克隆羊诞生图示 “多利多利”的诞生标志着克隆研究的诞生标志着克隆研究取得新的进展和重大突破取得新的进展和重大突破, ,而且这个结而且这个结果证明果证明: :动物体中执行特殊功能动物体中执行特殊功能, ,具有具有特定形态的所谓高度分化的细胞与受特定形态的所谓高度分化的细胞与受精卵一样具有发育成完整个体的潜在精卵一样具有发育成完整个体的潜在能力。也就是说能力。也就是说, ,动物细胞与植物细胞动物细胞与植物细胞一样一样, ,也具有全能性。也具有全能性。“多利多利”的诞生有