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
47
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
【C7】
选项
答案
N
解析
此处应为修饰成分,可为名词、形容词或动词的分词。从破折号前的ethical and practical considerations可以知道空白处提到的原因可能有悖伦理标准,即并非处于医学上的需要而使用了这种技术,由此可见,nonmedical是本题答案。
转载请注明原文地址:https://kaotiyun.com/show/DHa7777K
0
大学英语四级
相关试题推荐
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
Keepingafullsocialcalendarmayhelpprotectyoufromdementia(痴呆症),researcherssaidonMonday.【C1】______activepeople
FederalExpressisacompanythatspecializesinrapidovernightdeliveryofhigh-prioritypackages.Thefirstcompanyofitsty
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshareitwithalltheprimates(灵长类动物)andalmostallthe
ANiceCupofTeaTheLegendaryOriginsofTeaA)ThestoryofteabeganinancientChinaover5,000yearsago.Accordingto
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand
It’sveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
It’sveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow,anger,orjoy,typicallymakeAmericansfeeluncom
随机试题
A、Andersonishungry.B、Andersonisnothungry.C、Andersonisfull.D、Andersonisnotfull.B
关于Ig高变区,叙述错误的是
关于12个月龄小儿的生长发育状况,正确的是
A、獐牙菜苦苷B、水杨苷C、萝卜苷D、巴豆苷E、芦荟苷属于N-苷的化合物是
下列关于营业税纳税义务发生时间及纳税地点的表述,正确的是()。
中国A公司与外国B公司合资设立一中外合资经营企业。双方约定:企业总投资额为3300万美元,注册资本为1100万美元。双方这一约定符合中国法律规定。()
关于行为学习理论,以下哪一项最确切?()
儿童学习某种知识和形成某种能力或行为比较容易,心理某个方面发展最为迅速的时期,被称为儿童心理发展的()
宋朝法律中规定的不动产典卖契约的成立要件包括()(2010年非法学综合课多选第63题)
有一种观点认为,到21世纪初,和发达国家相比,发展中国家将有更多的人死于艾滋病。其根据是:据统计,艾滋病毒感染者人数在发达国家趋于稳定或略有下降,在发展中国家却持续快速发展;到21世纪初,估计全球的艾滋病毒感染者将达到4000万至1亿1千万人,其中,60%
最新回复
(
0
)