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求高中英语人教版必修1-5选修6-8的课文及英语单词录音MP3
求高中英语人教版必修1-5选修6-8的课文及英语单词录音MP3
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求高中英语人教版必修1-5选修6-8的英语课文单词录音MP3. 有的发到 非常感谢
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人教版高二英语选修8unit2课文逐句翻译
选修8 Unit 2 Cloning-Reading
CLONING: WHERE IS IT LEADING US?
克隆:在哪里带领我们吗?
& & & & Cloning has always been with us and is here to stay. It is a way of making an exact copy of another animal or plant. It happens in plants when gardeners take cuttings from growing plants to make new ones. It also happens in animals when twins identical in sex and appearance are produced from the same original egg. The fact is that these are both examples of natural clones.
克隆会始终伴随着我们,停在这里。它是一种使一个精确的拷贝另一动物或植物。它发生在植物生长当园丁把扦插植物结交新朋友。它也发生在动物当双胞胎相同的性和外观很由同一原始蛋。事实上,这些都是例子的自然的复制。
& & & & Cloning has two major uses. Firstly, gardeners use it all the time to produce commercial quantities of plants. Secondly, it is valuable for research on new plant species and for medical research on animals. Cloning plants is straightforward while cloning animals is very complicated. It is a difficult task to undertake. Many attempts to clone mammals failed. But at last the determination and patience of the scientists paid off in 1996 with a breakthrough - the cloning of Dolly the sheep. The procedure works like this:
克隆有两大主要用途。首先,园丁使用它产生商业价值的植物。其次,它是很有用的,为研究新植物和动物为医学研究。克隆植物克隆动物是简单的,是很复杂的。这是个艰难的任务,进行。多次试图克隆哺乳动物失败了。但最后,决心和耐心的科学家一次性付清1996年突破-克隆多利羊。过程是这样:
& & & & & &On the one hand, the whole scientific world followed the progress of the first successful clone, Dolly the sheep. The fact that she seemed to develop normally was very encouraging. Then came the disturbing news that Dolly had become seriously ill. Cloning scientists were cast down to find that Dolly's illnesses were more appropriate to a much older animal. Altogether Dolly lived six and a half years, half the length of the life of the original sheep. Sadly the same arbitrary fate affected other species, such as cloned mice. The questions that concerned all scientists were: &Would this be a major difficulty for all cloned animals? Would it happen forever? Could it be solved if corrections were made in their research procedure?&
一方面,整个科学界进步之后的第一个成功克隆,多利羊。这样的事实:她似乎正常发展是很令人鼓舞的。之后出现了令人不安的消息,多利已经病得很重。克隆科学家发现被摔下去多利的疾病更适用于更古老的动物。共朵莉住6年半,长度的一半生命的原始的羊。不幸的是同样的任意的命运影响其他物种,例如克隆老鼠。有关的问题,科学家们:&这是一个很大的困难,所有的克隆动物吗?它会发生到永远吗?如果修正它能解决在他们的研究过程吗?&
& & & & On the other hand, Dolly's appearance raised a storm of objections and had a great impact on the media and public imagination. It became controversial. It suddenly opened everybody's eyes to the possibility of using cloning to cure serious illnesses and even to produce human beings.
另一方面,多莉的出现了风暴的反对,有着极大的影响媒体和公众的想像力。它成为争议。它突然打开每个人的眼睛里的可能利用克隆技术来治疗严重疾病,甚至产生人类。
& & & &Although 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. Religious leaders also raised moral questions. Governments became nervous and more conservative. Some began to reform their legal systems and forbade research into human cloning, but other countries like China and the UK, continued to accumulate evidence of the abundant medical aid that cloning could provide. However, scientists still wonder whether cloning will help or harm us and where it is leading us.
虽然目前人类卵子和胚胎克隆研究需要也难取得、报纸写了邪恶的领导人希望克隆自己达到他们的野心。宗教领袖也提高了道德问题。政府变得紧张,更保守。一些开始改革研究法律制度、禁止人类克隆,但是其他国家如中国和英国,不断积累的证据表明丰医疗援助,克隆所能够提供的。然而,科学家仍不知道克隆将会帮助或伤害我们和在哪里带领我们。
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& & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & THE RETURN OF THE DINOSAURS?
& & & & The possibility of cloning fierce and extinct wild animals has always excited film makers. And they are not the only ones! The popularity of films such as Jurassic Park, in which a scientist clones several kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into people's hearts. But in fact we are a long way from being able to clone extinct animals. Scientists are still experimenting with cloning mammals. This is because the cloning of mammals is still a new science and its story only began seriously in the 1950s as this list shows:
他们可能会克隆激烈,灭绝的野生动物一直兴奋电影制作人。他们不是唯一!的受欢迎程度的电影如《侏罗纪公园》,在这一过程中,科学家克隆几种灭绝恐龙,证明他是多麽的想法混合了恐惧和激动人心。但事实上,我们还有很长的路要能够克隆灭绝的动物。科学家仍试验克隆哺乳动物。这是因为克隆哺乳动物仍然是一个新的科学与它的故事只有开始严重在20世纪50年代,因为这名单显示:
& &1950s cloning of frogs & & & & & & & & & & & & & & & & & & & & & & & &1996 first clone of a mammal: Dolly the sheep
& &1970s research using the embryos of mice & & & & & & 2000 cow gave birth to a bison
& &1979 work on embryos of sheep and mice & & & & & & &2001 China's first cloned twin calves
& &1981 first experimental clones of mice & & & & & & & & & & 2002 first cloned cats
& &1983 first experimental clones of cows & & & & & & & & & & 2005 first cloned dog
20世纪50年代克隆青蛙1996年第一次复制哺乳动物:多利羊
20世纪70年代的老鼠的胚胎论文以2000母牛生了一个野牛
1979年工作的羊和小鼠胚胎2001年中国第一个克隆的双胞胎的小牛
1981年,发明首个克隆的实验小鼠第一只克隆猫2002年
1983年克隆的第一个实验牛2005年第一次克隆狗
& & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & &
& & & & &From time to time people suggest that extinct animals like dinosaurs, can possibly be brought back to life through cloning. Unfortunately, with what we know now, this is either impossible or unsuitable. There are many reasons.
有时,人们建议绝种动物,像恐龙,可能带回生活通过克隆。不幸的是,我们现在所知道的,这不是不可能或不适合。有许多原因。
◎ The initial requirement is that you need perfect DNA (which gives information for how cells
& & &are to grow).
◎ All efforts of cloning an animal will be in vain if there is not enough diversity in the group to overcome illnesses. Diversity in a group means
& & &having animals with their genes arranged in different ways. The advantage is that if there is a new illness some of these animals may die,
& & &but others will survive and pass on the ability to resist that disease to the next generation. The great drawback to cloning a group of
& & &animals is that they would all have the same arrangement of genes and so might die of the same illness. Then none of them would be left to
& & &continue the species.
◎ It would be unfair to clone any extinct animals if they were to live in a zoo. A suitable habitat would be needed for them to lead a natural life.
◎最初的要求是你需要完美的DNA(提供信息,为细胞是如何
◎克隆动物的一切努力都是徒劳的,如果没有足够的多样性克服集团疾病。在一组多样性手段
在他们的基因动物以多种方法来安排。好处是如果有一个新的疾病这些动物之中,可死,
但是其他人会幸存,并且把这个疾病的抵抗能力给下一代。克隆的最大缺点的一组
他们都将动物的基因有相同的安排,所以可能会死相同的疾病。然后他们谁都不愿意将左
继续物种。
◎是不公平的任何绝种动物克隆如果他们能够生活在一个动物园里。需要合适的栖身之所过一种自然的生活。
& & & & &Based on what we know now, you cannot clone animals that have been extinct longer than 10,000 years. Actually, dinosaurs disappeared 65,000,000 years ago. So the chance of dinosaurs ever returning to the earth is merely a dream.
基于我们现在所知道的,你不能克隆已经灭绝的动物,它们比一万年。事实上,恐龙消失了6.5亿年前。所以恐龙的机会回到地球的仅仅是一个梦。
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