2020-2021学年人教版英语选修八课件：UNIT 2　CLONING PERIOD 1 WARMING UP & READING（1） .ppt

1、Period 1 Warming Up&Reading(1)Actually,cloning is a phenomenon that occurs naturally in a wide variety of species.Wheneveryou see a pair of identical twins,they are examples of natures clones.Although scientists have been cloning certain plants like the carrot quite successfully for decades,attempts

2、 at cloning animals have not been as successful.However,they began long before the birth of Dolly,the sheepthe first mammal to be successfully cloned.Cloning humans does give rise to some misgivings,raising a number of moral problems involved.Human cloning is basically about creating a genetically(基

3、 因 地)identical copy of a previously existing person.Whywould some people choose to clone human beings?Well,generally,it could make couples unable to have babies have their own children.Replacing a dead child is also another reason why some people have expressed interest in the technology.识图填空forbid,

4、twin,objection,procedure1The _are very much alike and its difficult for us to distinguish.2 We have to follow a series of _to make a frog out of paper.3This sign means parking is _ here.4 The citizens marched together to show their _ of violence.【答案】1twins2procedures3forbidden4objection.中英匹配1cast _2

5、object_3obtain _4breakthrough_5medium _6accumulate_【答案】1C2E3A4F5B6DAvt.获得；赢得 Bn.媒介；手段；工具Cvt.扔；投；掷 Dvt.&vi.积累；聚集Evi.反对；不赞成 Fn.突破.构词助记1straightforward_ adj.简单的；直接的；坦率的2undertake _ vt.着手；从事；承担3breakthrough_ n突破4carryier_n携带者；搬运工；运输工具5altogether _ adv.总共；完全地6correction _ n改正；纠正；修正【答案】1straightforward2un

6、dertake3breakthrough4carrier5altogether6correction.短语填空in favour of,pay off,object to,cast down1Jack is really having a hard timehe cant earn enoughmoney to _ _(偿清)the debts.2 At the UN conference,China strongly _ _(反 对)punishing the Arabic countries by force.3The people are _ _(使沮丧)by many years of

7、 civil war.4Are you _ _ _(赞成)the governments plan to build more railway lines?【答案】1pay off2objected to3cast down4in favour of.通读课文，选择最佳答案()1.The sheep that donated the somatic cell most probably lived _ years.A3B6C9D12()2.It can be inferred from the passage that a cloned animal _.Ausually lives as l

8、ong as the original oneBusually lives longer than the original oneCusually dies earlier than the original oneDis usually as healthy as the original one()3.In the second paragraph,the word“straightforward”means _.AuncomplicatedBhonestCfrankDdifficult()4.What is peoples fear about human cloning?Which

9、of the following is wrong?A Cloned Hitlers would do harm to the world.BCloned people may be killed at will for medical aid.C A woman would have difficulty recognizing her real husband.DMen will die out because a woman can give birth to a baby without a husband.()5.What is the writers attitude toward

10、 cloning in this passage?AThe writer is against cloning.BThe writer is in favor of cloning.CThe writer does not state any personal opinion about cloning.DThe writer is in agreement with cloning.【答案】15DCADC.精读课文，完成下表DefinitionCloning is a way of making a(n)1_ of another animal or plant.Major uses of

11、cloning Gardeners use it to produce 2_ quantities of plants.It is valuable for research on new plant species and for 3_ research on animals.About Dolly the sheep Encouraging news:Dolly developed 4_.Disturbing news:Dolly became seriously 5_ and lived six and a half years,half the length of the life o

12、f the 6_ sheep.Arguments over cloning Newspapers wrote of 7_ hoping to clone themselves to attain their ambitions and religious leaders raised 8_ questions.Some governments 9_ research into human cloning while others continued toaccumulate 10_ of the abundant medical aid cloning could provide.【答案】1e

13、xact copy2commercial3medical4normally5ill6original7evil leaders8moral9forbade10evidence.难句分析1Although at present human egg cells and embryos needed for cloning research are difficult to obtain，newspapers wrote of evil leaders hoping to clone themselves to attain their ambitions.本 句 的 主 干 是 _。althoug

14、h引导的_从句中，needed for cloning research是 过 去 分 词 短 语 作_，修饰human egg cells and embryos。在 主 句 中，hoping to clone themselves to attain their ambitions是动词ing形式短语作后置定语，修饰_。2Some began to reform their legal systems and forbade research into human cloning,but other countries like China and the UK,continued to

15、accumulate evidence of the abundant medical aid that cloning could provide.本句是一个由_连接的并列句。第一个分句中有两个并列的谓语动词：began和_。第二个分句中，that引导定语从句，修饰先行词medical aid。3However,scientists still wonder whether cloning will help or harm us and where it is leading us.本句的主句是_。whether和where分 别 引 导 两 个 从 句，作 wonder的_。【答案】1n

16、ewspapers wrote of evil leaders；让步状语；后置定语；evil leaders2but；forbade3scientists still wonder；宾语.根据课文把短文补充完整Cloning is a way of making an 1._ copy of another animal or plant.Cloning plants is 2._ but the cloning of animals is more difficult to 3._.Even so,the determination and patience of the scientists 4._(pay)off with a breakthrough.The fact 5._ the cloned sheep Dolly seemed to develop normally was very encouraging.【答 案】1.exact 2.straightforward3.undertake4.paid5that 6.cast7.appropriate8.objections9media10.forbidden