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  3. A bomb has landed on the world. Two prestigious doctors Panayiotis Zavos and Severino Antinori claim they are ready to embark on

A bomb has landed on the world. Two prestigious doctors Panayiotis Zavos and Severino Antinori claim they are ready to embark on

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问题     A bomb has landed on the world. Two prestigious doctors Panayiotis Zavos and Severino Antinori claim they are ready to embark on the greatest human experiment of our age. They say they will attempt to clone a human being before the year is out. Most people think the objections to this are ethical—human cloning would create many moral dilemmas.
    There is another question that few ever ask: is the science actually ready yet for cloning healthy humans? The latest research has led many scientists to believe that Zavos and Antinori’s plans to clone the first human could end in tragedy.
    For decades, cloning remained within the realms of science fiction. The idea that instead of combining a sperm and an egg, a new human could be made from a single cell taken from an adult, seemed completely absurd.
【C1】______
    But even Dolly’s creator, Professor Ian Wilmut, is concerned that beneath the veneer of success lies a disturbing reality. Most cloning attempts on animals so far have resulted in failed implantation or abnormal foetuses.
【C2】______
    Years of painstaking work are only now revealing some vital clues to what is going wrong. Scientists have uncovered new evidence, suggesting that the process of cloning itself causes subtle errors in the way genes function. These random errors may be like a time bomb inside every clone, causing some of the strange—often fatal—problems.
【C3】______
    Dr. Zavos claims that these problems are the result of the still unsophisticated methods being used by animal researchers.
【C4】______
    Now though, it seems that some IVF procedures themselves are being investigated for possible harmful effects on the long-term health of children. Professor Gerald Schatten of the University of Pittsburgh reveals evidence of these risks, which could be magnified in cloning.
【C5】______
    However, there are would-be human cloners who are determined to clone a human baby. If they proceed, they may be courting tragedy, some insiders observe.
[A]There’s no reason to think cloned human babies would fare any better. According to embryologist Dr. Susan Avery, death might be the best outcome for many human clones. If they survived, they would suffer from catastrophic illnesses that modern medicine is powerless to prevent or cure.
[B]As things stand, most reproductive specialists believe that the danger to any human born by cloning is enormous.
[C]Human cloning has been condemned by some of its most articulate opponents as the ultimate embodiment of the sexual revolution, separating sex from the creations of babies and treating gender and sexuality as socially constructed.
[D]The people who support human cloning speak of the plight of infertile couples; the grief of someone who has lost a child whose biological "rebirth" might offer comfort; the prospect of using cloning to generate donors for tissues and organs; the possibility of creating genetically enhanced clones with a particular talent or a resistance to some dread disease.
[E]Using advanced in vitro fertilization(IVF "test tube baby")techniques; he claims that he will strive to make human cloning safer than natural reproduction.
[F]Of the animals born alive, some soon die of catastrophic organ failure. Others appear to be healthy for weeks or even months, then die suddenly, sometimes from bizarre new illnesses which do not occur in nature.
[G]But that all changed in February 1997, when the Roslin Institute introduced the world to Dolly the sheep—the first animal cloned from an adult. Ever since Dolly, scientists have been continuing to experiment with cloning animals. So far, they have succeeded in cloning sheep, cattle, pigs, goats and mice, fuelling the belief that humans could be next.
【C5】
选项
答案B
解析 参照上下文，可知此处应该讲克隆人的实验仍然困难重重。绝大多数生殖专家认为，实验存在很大风险。
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