题目内容
引入型阅读
Human cloning－will it ever happen? One of the abiding(经久不衰的)science fiction nightmares has been the idea that we could one day replicate(繁殖)human beings asexually(无性地), just by copying material from human cells．
Scientists of Roslin’s Lab have announced that the nuclear transfer technique they have applied to produce Dolly(多利羊)could be in theory applied to humans．Whether anyone would try and whether it would work areanother matter．Scientifically it would still be a big leap to go from cloning a sheep to cloning humans．But the “what if” question must now be asked with much more seriousness than would have ever been justified before．
Cloning humans is ethically(从伦理上说)unacceptable．Dr Wilmut and his colleagues at Roslin have made it quite clear．Normal sexual reproduction always produces someone who will be unlike any other people who have existed, and whose characteristics and appearance will be unknown until they are actually born．However, on principle, to replicate any human technologically is against the basic dignity of the uniqueness of each human being．
Some have sought to counter this by saying that cloning is no more “unnatural” than twins．But there is a world of a difference ethically between the two processes．In the early stage of pregnancy, natural cell division leads to two genetically identical but, at that stage, unknown individuals．And to clone is to choose an existing individual of known characteristics and deliberately(故意地)make another of the same composition．
Most of the motives proposed turn out to be for the benefit of the person who wants the cloning done, or a third party, but not for the good of the individual．
1．What does the phrase “what if” mean?
2．Why is the idea of cloning humans not ethically acceptable to even the scientists who proved it technologically possible?
解析：
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1．假设；即使，有时 2．略 |
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