首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Once they decided to have children, MiShel and Carl Meissner tackled the next big issue: Should they try to have a girl? It was
Once they decided to have children, MiShel and Carl Meissner tackled the next big issue: Should they try to have a girl? It was
admin
2017-11-17
45
问题
Once they decided to have children, MiShel and Carl Meissner tackled the next big issue: Should they try to have a girl? It was no small matter. MiShel’s brother had become blind from a hereditary condition in his early 20s, and the Meissners had learned that the condition is a【C1】______passed from mothers to sons. If they had a boy, he would have a 50 per cent chance of having the condition. A girl would be【C2】______.
The British couple’s inquiries about gender selection led them in 1999 to Virginia, US where a new sperm (精子)-separation technique, called MicroSort, was under【C3】______. When MiShel became pregnant, she gave birth to a daughter. They will try to have a second daughter using the technique later this year.
The technique separates sperm into two groups—those that carry the X-chromosome (producing a female baby) and those that carry the Y-chromosome (producing a male baby). The technology was developed in 1990s, but last month’s opening of a laboratory in California【C4】______the company’s first expansion.
"We believe the number of people who want this technology is greater than those who have【C5】______to it," said Keith L. Blauer, the company’s clinical director.
This is not only a【C6】______effective way to select a child’s gender. It also brings a host of ethical (伦理的) and practical considerations—especially for the majority of families who use the technique for【C7】______reasons.
The clinic offers sex selection for two purposes: to help couples avoid passing on a gender-linked【C8】______disease and to allow those who already have a child to ’balance" their family by having a baby of the opposite sex
The technology is still【C9】______. However, Blauer says the company has an impressive success rate: 91 per cent of the women who become pregnant after sorting for a girl are successful, while 76 per cent who sort for a boy and get pregnant are successful.
The technique separates sperm based on the fact that the X-chromosome is larger than the Y-chromosome. A machine is used to【C10】______the size differences and sort the sperm accordingly. The result is then checked using another type of DNA analysis to ensure that it contains mostly X-or Y-bearing sperm. The desired sample is then used for artificial insemination (授精) or test tube fertilization.
A. genetic B. overlapped C. marked D. unaffected
E. perpetually F. investigation G. access H. feat
I. disorder J. gropes K. experimental L. seemingly
M. elicit N. nonmedical O. distinguish
【C9】
选项
答案
K
解析
此处应为形容词或动词的分词,作句子的表语。从本句中的still和下句However引出的内容可以知道,这种技术虽然成功率很高,但研究仍没有定论,因此本题答案应为experimental,表明技术仍处于“试验阶段”。在形容词词库中,nonmedical也可用于形容technology,但很明显,本文提到的技术就是与医学有关的,所以不选。
转载请注明原文地址:https://kaotiyun.com/show/PHa7777K
0
大学英语四级
相关试题推荐
Peopleappeartobeborntocompute.Thenumericalskillsofchildrendevelopsoearlyandsoinexorably(坚定地)thatitiseasyt
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshareitwithalltheprimates(灵长类动物)andalmostallthe
TipsforThoseWhoTravelAloneA)Whenitcomestotraveling,sometimestakingajourneyalonecanbegreat.Travelingalon
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humidorpollutedoutsideair,theyposemanypotentialhea
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humidorpollutedoutsideair,theyposemanypotentialhea
Costly—sometimesabusive—creditcardsarebleedingmillionsofborrowerswhodidn’tknowwhattheyweregettinginto.Thebo
随机试题
有“辛凉轻剂”之称的方药是
根据《城市规划编制办法》,编制城市规划,应当坚持()的原则。
背景资料:某公司承接一座城市跨河桥A标,为上、下行分离的两幅桥,上部结构为现浇预应力混凝土连续箱梁结构,跨径为70m+120m+70m。建设中的轻轨交通工程B标高架桥在A标两幅桥梁中间修建,结构形式为现浇变截面预应力混凝土连续箱梁,跨径为87.5
设备在闲置过程中,由于自然力的作用而腐蚀,或由于管理不善和缺乏必要的维护而自然丧失精度和工作能力的磨损属于()。
证券市场的形成主要归因于()。Ⅰ.股份制的发展Ⅱ.信用制度的发展Ⅲ.宏观调控的需要Ⅳ.社会化大生产和商品经济的发展
根据我国《民事诉讼法》的规定,下列不属于人民法院专属管辖的是:
行政法律关系是指由行政法律规范所调整的国家行政机关在行政管理活动中所发生的国家行政机关同其他主体之间的权利义务关系,是由行政机关行使国家行政权力而与其管理对象所发生的社会关系。其中积极行政法律关系是指为实现国家行政职能,兴办各种事业、管理各种行政事务而与有
互联网新的运营模式不断出现,技术发展______,这对版权保护也提出了更多挑战。从当前的司法实践来看,各地法院对网络运营商的责任认定也常常存在差异。著作权法的立法宗旨是“尊重智慧,鼓励创作和传播”,这在网络时代也应该______。填入画横线部分最恰当的一
截至2017年底,我国共有30个省(区、市)投产了747个生物质发电项目,并网装机容量1476.2万千瓦(不含自备电厂),年发电量794.5亿千瓦时。其中农林生物质发电项目271个,累计并网装机700.9万千瓦,年发电量397.3亿千瓦时;生活垃圾焚烧发电
Millionsofteenagersareindangerofputtingtheirhealthatriskbygettinghookedone-cigarettes,expertswarn.Leadinghea
最新回复
(
0
)