1.4 Unit2 DNA 同步素材（冀教版九年级下册）.doc

Lesson 11 Cloning people? 克隆人？◆课文英汉对照What if scientists could make clones of human beings? Each clone would have the same 如果科学家们会制造克隆人将会怎么样？ 每个克隆人都有相同的DNADNA. But would they be exactly the same as the original human? Or would they be 但是，他们和原始的人完全相同吗？ 或者（他们与原始的人）different?不同吗？Good question!好问题！In some ways, clones would be exactly the same. They would be the same height and they 在一些方面，克隆人会完全相同 例如：他们的身高相同且would have the same hair colour, for example. But each clone would be a different person. 头发的颜色相同。

但是，每一个克隆人是不同的人 Why? Because we are more than our DNA. Many things change us: the places we live, the 为什么呢？因为我们比DNA有更多的成分许多东西改变着我们： 我们居住的地方，food we eat and the people we know.我们吃的食物和我们认识的人Did you know?你知道吗？● We can only make clones from living DNA. After a person or animal has died, we cannot 我们只能用活的DNA制造克隆人 一个人或动物死了之后，我们就不能克隆clone them.他们了● There are two ways to clone people. We can divide a growing egg in half. Then we 有两种方式克隆人 我们能把一个活的卵细胞分成两个那么我would have two eggs with the same DNA. Or we could clone an adult person, the same way 我们会有两个DNA相同的卵细胞。

或者我们可以克隆一个成年人， 科学家们用相scientists cloned Dolly, the sheep.同的方法克隆了绵羊——多莉Would cloning humans be a good or bad thing?克隆人会是一件好事情还是一件坏事情呢？● Why would you clone someone? Some people worry about the answer to that question.为什么你要克隆人？ 一些人担心那个问题的答案● Other people think human cloning is okay. It may let scientists find new ways to help 其他的人认为克隆人很好 这也许能让科学家们找到帮助病人sick people.的新方法图片译文I think it would be fun to have a twin, but I don’t think I would want to be cloned! It’s crazy!我认为有个双胞胎会很有趣， 但是我认为我不想被克隆。

真荒唐！Changing DNA改变DNACan they do that?他们会那样做吗？Have you ever seen a pig with a dog’s body? Of course not! Pigs and dogs can’t have babies. 你曾经见过有狗的身体的猪吗？ 当然没有！ 猪和狗是不会有后代的They can’t combine their DNA.它们不能把它们的DNA合并起来But now, scientists can. Scientists can take DNA from one kind of animal and put it into 但是现在，科学们可以他们把一种动物的DNA拿出来，放进另一种动物的身体里another kind of animal. They can design new plants by combining the DNA of other plants. 通过合并其他植物的DNAThey can even combine the DNA of a plant and an animal.他们甚至能合并一种植物和一个动物的DNA。

What kind of DNA are they wearing?他们带有哪种DNA？Did you know that scientists have changed the DNA of some cotton plants? Many clothes are你知道科学家们已经改变了一些棉花植物的DNA吗？ 许多衣服是由made of cotton.棉花制成的Why did scientists change the DNA of cotton plants? Because insects damage many cotton 为什么科学家们改变了棉花植物的DNA？ 因为昆虫破坏了许多棉花植物plants. By changing the DNA, scientists made stronger cotton plants. 通过改变DNA， 科学家们培植了更加强壮的棉花植物What else have scientists designed by changing DNA?通过改变DNA，科学家们还设计了其他的什么东西？● A new kind of corn. Ordinary corn has a problem: insects like to eat it! But they don’t like 一种新型的玉米。

普通玉米有一个问题： 昆虫喜欢吃！ 但是它们不喜欢to eat the new corn.吃新型的玉米● A new kind of rice. Ordinary rice doesn’t have Vitamin A. the new rice does, and it’s better 一种新型的水稻 普通的水稻没有维生素A 但新型的水稻有， 并且它对for you.你更有益● Cows that make more milk.能产更多奶的牛What’s next?下一步是什么？Some scientists are worried. They say we need to know more about DNA before we start 一些科学家很担心 他们说在我们改变DNA之前，我们需要更多地了解DNAchanging it. We can make plants that are bad for insects. But what if the plants are bad for 我们可以培育有害于昆虫的植物。

但是，如果这种植物对人也有害将会humans, too? Humans are us! People!怎样？ 人就是我们！人们！LET’S DO IT!做一做！A debate is an argument between two groups. One group argues for an idea; the other argues 辩论就是两个小组之间的争辩 一个小组赞成一个观点， 另一个小组反对against it. Plan a debate about this topic: is it a good idea to change the DNA of the food we 这个观点设计一个关于这个主题的辩论：改变我们吃的食物的DNA是一个好主意吗？eat? Some people say doing this makes our food better. Others think it is too dangerous. Search the 一些人说这样使人们的食物更好 另一些人认为这太危险 上网查寻internet for information to help your argument!信息以帮助你的辩论。

◆重点难点详解1. What if scientists could make clones of human beings? 如果科学家们会制造克隆人将会怎么样？human being “人，人类”注意它的复数直接在being的后面加“s”， 即human beings辨析human, man和 mankind1. human being它是可数名词，有单复数之分其意义比较具体，指区别于动物或上帝的“人”，它常和 animal同时出现在句中，形成对比●They are not the bones of an animal, but of a human being’s.它们不是动物的骨头，而是人的骨头●Human beings are a lot cleverer than animals. 人类比动物要聪明得多2. man一般以单数形式出现表示人类，其前没有任何限定词，但现在也有人用 men表示“人类” 其相应的代词应是he, him, his, himself●Man is fighting a battle against pollution. 人类正在与污染作斗争●At present man is studying the universe better. 当前人类正在更好地研究宇宙。

mankind前也不可以加任何限定词，但可用形容词修饰它是集合名词，可作单数或复数使用作单数概念时，谓语要用单数，其相应的代词一般为it, its, itself(也有人用he ,him, his, himself)；作复数概念时，谓语要用复数，其相应的代词是they, them, their, themselves●Mankind is much richer and stronger than it was 100 years ago.人类比１００年前更富有、强大了●Disease is an enemy of mankind. 疾病是人类的敌人。