选修八Unit2Reading杨凡1.ppt

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1、ReadingTwinsThey are born naturally and identical in sex and appearance.Natural clone is one that occurs in a natural form of cloning without humans help. Man-made clone is one that produced through human intervention(介入) .In pairs, look at these pictures and discuss which ones are natural clones an

2、d which ones are man-made. Explain how they differ.DiscussionA strawberry plantThe new plants that grow from the runners are exact copies of the original plant.一株草莓依靠它沿地一株草莓依靠它沿地“爬走爬走”的匍匐茎的匍匐茎,一年内就能长出数百株草莓苗。一年内就能长出数百株草莓苗。A strawberry plantGrowing new plantsDolly the sheepShe was cloned while the oth

3、ers were born naturally.Dolly was a _ sheep.clonedHow does Dolly differ from other sheep?2001 cloning cattle2002年年4月月16日日美国第一头克美国第一头克隆牛隆牛“艾米艾米”产下牛犊喜作产下牛犊喜作妈咪。妈咪。我国成功繁殖克隆兔我国成功繁殖克隆兔 体形要比普通兔大许多体形要比普通兔大许多2002年年5月月中旬成功地中旬成功地繁殖了一只繁殖了一只胚胎细胞胚胎细胞克隆兔。克隆兔。2002 cloning cats2005 cloning dogs1. What is the main t

4、opic? A. Cloning. B. Dolly the sheep . C. It will lead us to some places.2. What is the writing style? A. Expositive (说明性的说明性的). B. Descriptive. C. Argumentative (议论性的议论性的).A A Learning tips: The passage is written in the expositive style. That is to say, the text is in the third person and in factu

5、al and formal language. It gives different points of view but does not try to persuade the reader to make up his/her own mind.3. 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

6、 birth to it. D. had the characteristics of all three sheep.B 4. 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 dies earlier than the original one D. is usually as healthy as the origina

7、l oneC 5. 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. Cloning can help keep animals from becoming extinct.D. Famous persons who have passed away can be cloned.D 6. Which of the following

8、is wrong?A. Cloned people could live forever.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.A 7. Which statement is NOT true?A. Cloning is something th

9、at 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.A 8. The cloning of Dolly the sheep succeeded because _. A. its easier to clone a

10、sheep than other animals B. the scientists were determined and worked hard with patienceC. the scientists were rewarded and got lots of moneyD. many other attempts to clone mammals failedB 9. The lamb is the clone of the cell from sheep B because _. A. it provides the egg cell B. it gives birth to t

11、he lamb C. it provides the nucleus D. it is a female sheep10. The sheep that donated the somatic cell most probably lived _ years. A. 3 B. 6 C. 9 D. 12C D 11. 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

12、 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.D 12. We can infer from the last three paragraphs that _. A. the normal development of Dolly had no effect on the cloning of

13、 other species. B. Dollys serious disease and final death disturbed the whole world. C. Dolly successfully cloned a new lamb with the help of cloning scientists. D. there were arguments about animal cloning and concerns about the future of cloning.D Cloning is a way of making an exact copy of anothe

14、r animal and plant.What is cloning ?It happens both in _ and in_. They can be cloned by _ and _.plantsanimalsthemselveshumansNatural cloneMan-made clonePara 1 The _ of cloningdefinition1.How many major uses do cloning have? Firstly, commercial Secondly, research2. When was the cloning of Dolly the s

15、heep born?Para 21996The major _ and _ of cloningusesproceduresAt first, the fact that Dolly developed _ 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_

16、 the original one.Para 3The _ of Dollynormallyencouragingorginalthatas long as / shorter than / longer thandisturbingshorter thanproblemsThe word “controversial” in para 4 probably means _. A. complicated B. arguable C. importantPara 4The _ of DollyimpactTrue or false:1 People feared that Cloned Hit

17、lers 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 5Peoples _ to cloningMany governments forbade reserch into human beings.attitudes the author does not state any personal opinion about cloning. A. Objective (be

18、 fair) B. Negative (be against it) C. Positive (be in favor of it)The writers attitude towards cloningBecause_Practice activity: Debate Are you in favor of cloning or against cloning? What is your point of view on it?Cloning is valuable for _ research on animals. medicalAdvantages of cloningMedical

19、cloning could produce _for serious illnesses in humans.curesCloning plants can produce large _ of plants for _.quantitiesCloning plants can be useful for research on _ _ _.speciesplantsalenewProblems of cloningAnimal clones may develop the _ of older animals.illnessesAnimal clones may die _ than the original animals.younger_ _ may want to clone themselves.There are _ _to cloning human beings.Evil leaders moralobjections