Unit 3 Period One

Unit 3 Science and nature Cloning extinct and endangered species 什么是克隆克隆技术如何在生活中应用才能更好地为人类服务文章通过一些实例给出了答案。 Cloning，or more precisely，the reconstruction of functional DNA from extinct species has，for decades，been a dream.The best current cloning techniques have an average success rate of 9.4 percent.Several tissue banks have come into existence，including the “Frozen Zoo” at the San Diego Zoo，to store frozen tissue from the world’s rarest and most endangered species. In 2019，a cow named Bessie gave birth to a cloned Asian gaur亚洲白肢野牛，an endangered species，but the calf died after two days.In 2019，a banteng爪哇野牛was successfully cloned from a thawed frozen embryo. These successes provided hope that similar techniques might be used to clone extinct species.In January 2009，for the first time，an extinct animal，the Pyrenean ibex阿尔卑斯山的野山羊was cloned，at the Centre of Food Technology and Research of Aragon，using the preserved frozen cell nucleus of the skin samples from 2019 and domestic goat egg－cells.The ibex died shortly after birth due to physical defects in its lungs.Researchers are also considering cloning endangered species such as the giant panda and cheetah猎豹. In 2019，geneticists at the Australian Museum announced that they had replicated复制DNA of the thylacine 袋狼，at the time extinct for about 65 years，using polymerase chain reaction聚合酶链式反应. Scientists at the University of Newcastle and University of New South Wales announced in March 2019 that the very recently extinct gastric－brooding frog胃育蛙 would be the subject of a cloning attempt to resurrect 复活the species. 词海拾贝 1 e into existence 成立 2.give birth to 生产；生育 3.be used to 被用于 4.for the first time 首次；第一次 5.due to 由于；因为 6.such as 例如 7.at the time 在那时 8.attempt to do sth 企图做某事 Period One Welcome to the unit Reading Ⅰ.单词自测 1.clone vt.克隆； n.克隆出来的动物或植物 2.tissue n.生物的组织；纸巾 issue n.问题；争端；发行 3.real－life adj.真实的，现实生活中的 life－like adj.逼真的，活灵活现的 4.exact adj.精确的，精确的 exactly adv.精确地，精确地 5.intention n.意图，目的；企图 intend vt.准备，意欲 6.anxiety n.忧虑，焦虑，担忧 anxious adj.焦虑的 7.adopt vt.收养，领养；接受，接受 adapt vt.适应；改编 8.legal adj.法律许可的，合法的 legally adv.合法地 9.physician n.内科医生；医师 surgeon n.外科医生 dentist n.牙科医生 10.consequence n.结果，后果 consequent adj.随之而来的，作为结果的 consequently adv.因此，所以 11.harvest vt. vi.收割庄稼；n.收获；收成 12.trans vt.使变更外观或性质尤指向好的方向；使变更形态 13.concept n.概念；观念 14.crime n.罪，罪行 Ⅱ.短语默写 1.on the one hand...on the other hand... 一方面另一方面 2.in general 总体上来说 3.concentrate on 集中精力于，聚精会神于 4.show respect for 对表示敬意 5.push ahead with 义无反顾地进行，努力推动 6.toy with 戏弄，摆布；把当作儿戏 7.for sale 待售，供出售 8.in agreement with 和看法一样 9 e across 偶然发觉，遇见 10.take away 带走；消退，解除 阅读清障 ①announce vt.宣布，宣告，通知 announcement n.宣告，通告，通知 ②clone/kləʊn/vt.克隆n.克隆出来的动物或植物 ③embryo/embrIəʊ/n.胚胎 ④on the one hand一方面 ⑤point out指出 ⑥tissue/tIʃu/n.生物的组织；纸巾 ⑦be used to do被用来做 ⑧on the other hand另一方面 ※介词短语including some scientists＝some