阅读理解:
Clone Farm
Factory farming could soon enter a new era of mass production. Companies in the US are developing the technology needed to clone chickens on a massive scale. Once a chicken with desirable traits has been bred or genetically engineered, tens of thousands of eggs, which will hatch into identical copies, could roll off the production lines every hour. Billions of clones could be produced each year to supply chicken farms with birds that all grow at the same rate, have the same amount of meat and taste the same. Thats unlikely to put off the poultry industry, however, which wants disease resistant birds that grow faster on less food. Producers would like the same meat quantity but to use reduced inputs to get there, says Mike Fitzgerald of Origen. To meet this demand, Origen aims to create an animal that is effectively a clone, he says. Normal cloning doesnt work in birds because eggs cant be removed and implanted, Instead, the company is trying to bulk-grow embryonic stem cells taken from fertilized eggs as soon as theyre laid. The trick is to culture the cells without them starting to distinguish, so they remain pluripotent, says Fitzgerald.
Another challenge for Origen is to scale up production. To do this, it has teamed up with Embrex, which produces machines that can inject vaccines into up to 50,000 eggs an hour. Embrex is now trying to modify the machines to locate the embryo and inject the cells into precisely the right spot without killing it.
41.Which statement is the best description of the new era of factory farming according to the first paragraph?
B. Thousands of eggs are produced every hour.
D. Identical eggs can be hatched on the production lines.
A. The USs National Institute of Science and Technology.
C. Embrex of North Carolina.
43. In the third paragraph, by saying Producers would like the same meat quantity but to use reduced inputs to get there. Mike Fitzgerald means that he wishes
B. chickens taste could be improved but at less costs.
D. chickens could grow to the same weight but with less feed.
A. Origen and Embrex will jointly invent machines to increase production.
C. Origen has joined hands with Embrex in producing cell-injecting machines.
45. The technology of freezing stem cells from different strains of chicken can do all the following EXCEPT that
B. Origen can supply all the strains of chicken the market might need.
D. chicken farmers can be supplied with whatever strain they need.
真的猛士 美国9岁男孩徒手斗鳄鱼
韩郭电影大比拼 讲述不一样的中国
孕动芭蕾 准妈妈们的新选择
英仙座流星雨观赏小贴士
美国第一夫人米歇尔:女性比男性更聪明
非洲象在动物王国中嗅觉最灵敏
历史上的尼克松 真的是演说家和骗子?
大数据时代上演的的人才争夺战
《死亡诗社》罗宾•威廉姆斯自杀 大事盘点
飞机又失事了!德黑兰坠机 盘点伊朗空难
大象用汽车挠痒痒 你考虑过乘客的感受咩
高露洁全效牙膏中的三氯生可能致癌
属于年轻人的话题 DOTA冠军背后的故事
想做讨人喜欢的人 16件事情要努力
六种食物加速衰老
魔法校长“邓布利多”写信安慰悲伤少年
英政府神规定 无法驱逐的恐怖分子
世界左撇子日 关于左撇子你不知道的6件事
峡谷天使离开人间 一生守护自杀圣地
一个时代的终结 好莱坞女星劳伦白考尔逝世
埃博拉病毒:你应该知道的12件事
打造芭比男友:巴西男模砸重金变身肯尼
靠脸吃饭 相貌如何决定你的职场前景
旅游达人 削减旅游花费的11种方法
疑丈夫见小三 加拿大女子怒拦飞机
真正“海誓”山盟 美夫妇海底婚礼
哪些个人信息不适合在社交网络上分享?
致宅家学生:大学暑期工的明智十选
5岁女儿筹款带绝症爸爸游玩迪士尼
法国女性为什么不再祼露上身晒日光浴?
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |