选修八Unit_2 Cloning原文翻译

来源:网络收集 打印文章内容   下载WORD版到本地  

Uint2 Cloning 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. 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: 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?" 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. 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. Unit 2 克隆:他将把我们引向何方? 克隆一直与我们同在,而如今它还要坚持下去。

这是一种用来生产与原型完全相同的动植物的方法。

当园艺师从生长的植物上剪下枝条来培植新植物时,就会产生这种现象。

这种现象也发生在动物身上,从同一个原生卵子产生性别和相貌相同的双胞胎也是克隆。

实际上,这

  • 高中英语 Unit 2 Cloning 听力原文练习 新人教版选修8

    高中英语 Unit 2 Cloning 听力原文练习 新人教版选修8

    高中英语 Unit 2 Cloning 听力原文练习 新人教版选修8...

    贡献者:网络收集
    213988
  • 高中英语讲义:选修八 unit 2 cloning 含答案

    高中英语讲义:选修八 unit 2 cloning 含答案

    高中英语讲义:选修八 unit 2 cloning 含答案...

    贡献者:网络收集
    783169
  • 高中英语人教版讲义:选修八 unit 2 cloning 含答案

    高中英语人教版讲义:选修八 unit 2 cloning 含答案

    高中英语人教版讲义:选修八 unit 2 cloning 含答案...

    贡献者:网络收集
    618291
  • 山东省新泰市第二中学选修八英语《Unit 2 Cloning》单词(学案)

    山东省新泰市第二中学选修八英语《Unit 2 Cloning》单词(学案)

    山东省新泰市第二中学选修八英语《Unit 2 Cloning》单词(学案)...

    贡献者:网络收集
    891971
  • 2014-2015学年高中英语 Unit 2 Cloning 听力原文练习 新人教版选修8

    2014-2015学年高中英语 Unit 2 Cloning 听力原文练习 新人教版选修8

    2014-2015学年高中英语 Unit 2 Cloning 听力原文练习 新人教版选修8...

    贡献者:网络收集
    885935
  • 2019版一轮优化探究英语(人教版)练习:选修八 Unit 2 Cloning Word版含答案

    2019版一轮优化探究英语(人教版)练习:选修八 Unit 2 Cloning Word版含答案

    2019版一轮优化探究英语(人教版)练习:选修八 Unit 2 Cloning Word版含答案...

    贡献者:网络收集
    468948
  • 高中英语 Unit 2 Cloning学案 新人教版选修8

    高中英语 Unit 2 Cloning学案 新人教版选修8

    高中英语 Unit 2 Cloning学案 新人教版选修8...

    贡献者:网络收集
    825990
  • 英语:unit2-《cloning》-reading课件(新人教版选修8)

    英语:unit2-《cloning》-reading课件(新人教版选修8)

    英语:unit2-《cloning》-reading课件(新人教版选修8)...

    贡献者:网络收集
    312525
  • 高中英语人教版选修8-Unit_2-Cloning-学案

    高中英语人教版选修8-Unit_2-Cloning-学案

    高中英语人教版选修8-Unit_2-Cloning-学案...

    贡献者:网络收集
    39921
  • 高中英语人教版选修8-Unit_2-Cloning-学案答案

    高中英语人教版选修8-Unit_2-Cloning-学案答案

    高中英语人教版选修8-Unit_2-Cloning-学案答案...

    贡献者:网络收集
    495285
  • 网友在搜
    家装水管试压多长时间 关于励志故事50字 scala 传递方法 平凡日子里的刺 对白 芭比长发公主中文版 水果忍者v1.8破解版 dota 群嘲 塘厦发电机回收 西班牙卡尔切酒贵不贵 nginx反向代理 swoole 绿轴和青轴声音哪个脆 眼中间有个褐色斑点 遵义欧亚男健曝光 蓝瘦和香菇是什么意思 washington dc time 血缘诅咒不可见的村庄 风电场风切变指数 涩世纪传说小说 百度云 泰剧网她的罪5土豆网 金钥匙交易网 黄金瞳全文阅读无错版 编程注释美观 干烧牛肉丝的做法大全 axios post payload 永久龙骑r06-4怎么样 java数组怎么添加数据 拳皇2003卧虎qq龙下载 梁家辉版棋王在线观看 三明电信dns是多少 ostelin维生素d吃法 杨姣怎么不火了 webuploader怎么样 十八岁出门远行 象征 德国欧乐家热水器图 c# api hook 基恩士sr1000 pdfbox vs itext 兰蔻微修护乳液 k studio 馨悦 000557西部创业 维基百科中文台湾网站 javascript map index jag bvrisi csgo2017年top20 金士顿100g3短接 汉阳医院遛狗的美女 美式木吊顶装修效果图 非线性变压器 秦淮区马道街拆迀安置 huada.onlyet 网络小说 穿越 导演 碟中谍1 下载 iso用什么播放器 恒银金融江浩然的妻子 终电 泥醉千冬 chinese calendar 1979 acca f8 mike网课 植物大战僵尸游戏版

    声明:本站内容源于网络,出于传递更多信息之目的,并不意味着赞同其观点或证实其描述。文章内容仅供参考,请咨询相关专业人士。

    如果无意之中侵犯了您的版权,或有意见、反馈或投诉等情况, 联系我们:shnews500#tom.com

    All Rights Reserved 千媚果 手机站 网站地图 网站栏目