初中英语Lesson 19 Conjoined Twins英语听力.doc

初中英语Lesson 19 Conjoined Twins英语听力:asf听力文件无病毒，请放心打开听力理解 Key words: 1. conjoined 联合的，共同的 2. identical（生物）同卵共生的 3. egg 卵子4. fertilize 受精，受胎 5. fraternal 异卵双生的 6. Children’s Medical Center 儿童医学中心 7. ligament 韧带，系带 8. entwine 编织，使缠绕 Exercises:I. Fill in the blanks with the words you have heard from the report. 1. _______ twins _______ about once out of every _______ births of _______ twins. 2. Medical _______ say _______ and environmental _______ are involved in the _______ of conjoined twins. 3. Conjoined twins may be _______ only by a _______ piece of tissue, or they may be _______ at the _______ or other part of the body. 4. Historically, the _______ rate for conjoined _______ has been between _______ and _______ percent. 5. The book Entwined Lives says _______ have _______ about 200 _______ to _______ conjoined twins.II. Complete the statements with the information you have heard from the report. 1. Some estimates say that one in as many as eighty-thousand of all births _______. 2. Some twins _______ that are fertilized at the same time. These babies are called fraternal twins. 3. Sometimes the _______. This produces twins who are physically linked. 4. Today, most conjoined twins are found during examinations _______. 5. The book says most of the operations resulted in the _______.Conjoined Twins This is Phyis Roberts with the VOA Special English Health Report. Some estimates say that one in as many as eighty-thousand of all births results in two babies joined together. Conjoined twins happen about once out of every 200 births of identical twins. Some twins develop from two separate eggs that are fertilized at the same time. These babies are called fraternal twins. One can be a girl and the other a boy. Other twins develop from a single egg. These are called identical twins. Identical twins result when a fertilized egg divides into two. Sometimes the division begins but is not completed. This produces twins who are physically linked. Medical experts say genetic and environmental influences are involved in the development of conjoined twins. Recent separations have taken place in Britain, Singapore, Italy, Australia and the United States. These included an operation where doctors at the Children’s Medical Center in Dallas, Texas, separated two Egyptian boys joined at the head. Conjoined twins may be linked only by a thin piece of tissue, or they may be attached at the chest or other part of the body. Sometimes they share a heart or other internal organ. In the past, conjoined twins were called Siamese twins. This was because the first well-known twins were born in Sima, the country now called Thailand. Chang and Eng were born in 1811. A twelve-centimeter-long ligament near their breastbones connected them. Chang and Eng grew up married and had a total of twenty-one children. The two men died in 1874. Historically, the survival rate for conjoined babies has been between five and twenty-five percent. But medical progress has increased those chances. Today, most conjoined twins are found during examinations before they are born. Some are easier to separate than others. The book Entwined Lives by Nancy Segal says doctors have performed about 200 operations to separate conjoined twins. Ninety percent have taken place since 1950. The book says most of the operations resulted in the survival of at least one of the babies. One Web site where you can learn more about conjoined twins is . This VOA Special English Health Report was written by Nancy Steinbach. This is Phyis Roberts.连体双胞胎 这里是由菲斯罗伯茨为您报道的美国之音特别英语健康报道。

有人估计，每八万个新生婴儿中就有一对是连体婴儿每200个同卵共生的双胞胎中就有一对是连体双胞胎 有些双胞胎是由两个卵子同时受精发育而成的我们称这样的婴儿为异卵同生双胞胎其中可能一个是女孩，另一个是男孩还有些双胞胎是由一个卵子发育而成的，我们称其为同卵同生双胞胎当一个受精卵子分成两个时就会发育成同卵同生双胞胎 有时这种分离不彻底，这将发育成为连体双胞胎医学专家说，连体双胞胎的发育与基因和环境影响有关 最近，英国、新加坡、意大利、澳大利亚和美国都进行过一些连体双胞胎分离手术其中有一例是两名埃及男孩头部分离手术，医生们在得克萨斯州的达拉斯儿童医学中心实施了此例手术连体双胞胎或许只有一薄层组织连着，或许胸部或身体的其他部位连在一起有时候他们共用一个心脏或其他内脏 过去，连体婴儿被称作暹罗双胞胎这是因为第一例著名的连体双胞胎出生在暹罗湾，就是现在的泰国昌和恩出生于1811年胸骨附近一根12厘米长的韧带把他们连在了一起昌和恩长大后，结了婚，总共生了21个孩子这两名男子于1874年去世 过去，连体双胞胎的成活率为5%到25%但医学的进步增加了他们存活的机会今天，大部分连体双胞胎在出生前就被检测到了。

有些连体双胞胎比其他的连体双胞胎更容易分离 南希西格尔编写的《连体人的生活》一书中讲到，医生已进行连体双胞胎分离手术达200例左右90%的手术是1950年以后进行的该书写道，大部分手术使两人中至少一人生存了下来您还可通过登陆网站了解更多有关连体双胞胎的信息 本篇美国之音特别英语健康报道由南希斯坦贝奇撰稿，菲斯罗伯茨报道 答案：I. 1. Conjoined/ happen/ 200/ identical 2. experts/ genetic/ influences/ development 3. linked/ thin/ attached/ chest 4. survival/ babies/ five/ twenty-five 5. doctors/ performed/ operations/ separateII. 1. results in two babies joined together 2. develop from two separate eggs 3. division begins but is not completed 4. before they are born 5. survival of at least one of the babies用心 爱心 专心。