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Cloning,Unit 2,In the movie Jurassic Park, scientists clone dinosaurs by using the DNA that was preserved for millions of years. However, there is trouble when the cloned dinosaurs turn out fiercer and smarter than expected. Can dinosaurs really be cloned? Theoretically, they can; all that would be required is DNA from an extinct dinosaur and a currently living closely related species which would act as a surrogate mother(代孕母親). In fact, there is continuing research to clone the Woolly Mammoth by extracting (提取) the DNA from frozen animals.,,Actually, cloning is a phenomenon that occurs naturally in a wide variety of species. Whenever you see a pair of identical twins, they are examples of nature's clones. Although scientists have been cloning certain plants like the carrot quite successfully for decades, attempts at cloning animals have not been as successful. However, they began long before the birth of Dolly, the sheep—the first mammal to be successfully cloned.,Cloning humans does give rise to some misgivings,_raising a number of moral problems involved. In fact, the social influences of producing humans artificially were brilliantly explored in the famous novel Brave New World by Aldous Huxley, and also in the movie The Island.,Human cloning is basically about creating a genetically(基因地) identical copy of a previously existing person.Why would 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.,文章大意：本文是說明文。介紹了克隆的相關(guān)情況。 1．The purpose of the first paragraph is to ________. A．give us an introduction to a movie B．a(chǎn)nalyse the possibility of cloning C．give an introduction to the text D．tell us the importance of cloning 答案：C 從后文內(nèi)容可知，第一段主要是為了引出下文。,2．We can infer from the second paragraph that ________. A．more and more people are interested in cloning B．cloning has saved many animals from dying out C．cloning has a very short history D．cloning plants is much easier 答案：D 第二段說明，人們已經(jīng)成功克隆了植物，而動物還不太成功，說明克隆植物要比克隆動物簡單得多。,3．In what way is human cloning useful? A．It can bring a dead person back to life. B．It makes it possible to replace a dead child. C．It can help cure some human diseases. D．It can help people have more healthy children. 答案：B 從最后一段可知，克隆人可以替代一個死了的孩子或者幫助不孕夫妻受孕。,4．What does the underlined word“misgivings” in the third paragraph mean? A．Worries. B．Aims. C．Regulations. D．Principles. 答案：A 從該詞后的raising a number of moral problems involved可知，克隆人引起了很多擔(dān)憂。,5．What attitude do people have towards human cloning? A．They think human cloning is useless. B．They believe it can help humans in many ways. C．They believe it can cause many moral problems. D．They doubt whether it can succeed or not. 答案：C 從第三段可知，克隆人一直是一個存在爭議的問題，涉及很多道德問題。,