SAT写作素材练习克隆人

2019-10-07 20:15:11来源：网络

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　　为了帮助大家高效备考SAT，新东方在线SAT频道为大家带来SAT写作素材练习克隆人，希望对大家SAT备考有所帮助。更多精彩尽请关注新东方在线SAT频道!

　　U.N. Committee Split Over Treaty to Ban Human Cloning

　　The U.S. drive to enact a broad global ban on human cloning has suffered a severe setback at the United Nations. It also reveals a deep split within the world body on the cloning issue.

　　The U.S. and Costa Rican proposal calling for drafting an anti-cloning treaty had nearly 50 co-sponsors, and was expected to pass easily. But it is fiercely opposed by many in the scientific community, who argue there is a need for therapeutic cloning for research and medical purposes.

　　A rival resolution sponsored by Belgium and supported by Britain, France, and Germany, among others, would have banned only the cloning of babies. After the vote, Deputy U.S. Representative James Cunningham said he was disappointed that countries opposing a total ban had used a technicality to derail the will of a majority of the international community.

　　"It is particularly regrettable that it was by a margin of only one vote that we will be prevented from formally registering that more than 100 members of the Untied Nations favor the pursuit of the goal, of a total ban on human cloning," he said.

　　The vote effectively puts off for two years any work on drafting an international treaty banning human cloning. Several European diplomats regretted that the move leaves the issue of cloning in 9)limbo. But one Belgian diplomat told reporters, many who voted no believe it may be better not to push forward on drafting a comprehensive treaty at a time when the world, and even the scientific community, is so deeply divided on the question.

　　克隆人的意义

　　克隆人的好处第一是可以让那些得不到孩子而非常痛苦的不育患者有自己的孩子。其二，这样的克隆是只用丈夫妻子自己的精子卵子，这就避免了伦理上和心理上的阴影。还有，克隆还可以挽救濒危动物，保持人群性别的合理平衡，保护少数民族遗传基因。更重要的是，克隆人可被用来研究，以比较和证明环境与遗传对人成长究竟哪一个更重要。

　　你们所说的这些当然有一些科学事实，但是并没有完全从科学上得到证实，而且有些科学实验还得出了相反的结论。比如，美国康涅狄格州的华裔科学家杨向中用一头13岁的老母牛的体细胞成功地克隆了10头牛犊，从DNA分析发现，克隆牛的端粒远远比其供体母牛的长，而且与自然生育的同龄小牛的端粒没有差别。这说明克隆牛的生物年龄与自然有性生育的牛的年龄完全一致，证明克隆后代没有早衰现象。

　　克隆人是人类繁衍的一种方式和权利。全世界共有7000万男子没有任何形式的生育能力，克隆人是人类最后的繁衍方式，要攻克男性不育症，克隆技术可能是最后一柄利剑。而且也有很多不育的人因不能产生成熟精子主动要求科学家用克隆技术帮助他们孕育孩子。他们也有养育孩子、获得天伦之乐的权利。

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