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
2016-10-07
63
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/rvY7777K
0
大学英语四级
相关试题推荐
A、Theyshouldgiveuptalking.B、Theyshouldbothmakeacompromise.C、Theycanmeetnexttime.D、Theyarebothhalfway.B男士话中的“
We’renowwitnessingtheemergenceofanadvancedeconomybasedoninformationandknowledge.Physical【B1】_______,rawmaterials
MobilePhonesintheClassForthispart,youareallowed30minutestowriteashortessay.Youshouldstartyouressaywitha
A、Surprised.B、Disappointed.C、Delighted.D、Positive.D
A、HeprefersGermanytootherEuropeancountries.B、Hepreferslargenoteswhentraveling.C、He’drathertaketraveler’schecks
EndangeredPeoplesA)Today,itisnotdistance,butculturethatseparatesthepeoplesoftheworld.Thecentralquestionofour
EndangeredPeoplesA)Today,itisnotdistance,butculturethatseparatesthepeoplesoftheworld.Thecentralquestionofour
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesinknowledge,therehasbeennocorrelativeincreasein
Accordingtonewgovernmentfigures,pollutionlevelsarerisingagainafterseveralyearsofgradualdecline.Data【C1】_____
随机试题
架空和挂墙电缆接头要求位置稍高于电缆,形成接头两端自然下垂,接头拉链安放在套管下方。()
Windows操作系统的作用是()。
婴儿期发育性髋关节脱位的典型体征是:()
现代医学模式对临床诊治工作道德的影响主要表现在
跟踪偏离度的计算公式为()。
A公司有关金融资产资料如下:(1)A公司对于单项金额非重大的应收款项与经单独测试后未减值的应收款项—起按类似信用风险特征划分为若干组合,再按这些应收款项组合在资产负债表日余额的—定比例计算确定减值损失,采用账龄分析法计提坏账准备。其中1个月内计提准备比例
公文语言的主要特点是()。
甲因有事要长时间外出,临行前几天与乙约定,将甲未婚妻赠与其的一块价值2万元的名贵手表交由乙保管,回来后请乙吃饭。3日后甲外出,同时将表交至乙处。2个月后,因乙急需用钱,便以2.5万元的价格将手表卖给丙,丙并不知道手表非乙所有。在丙付款后,乙将手表交付给丙。
设函数f(x,y)及它的二阶偏导数在全平面连续,且f(0,0)=0,≤2|x-y|.求证:|f(5,4)|≤1.
A、Dianaisfondofoutdooractivities.B、Dianaiswell-paidforherhardwork.C、Dianadislikesherjobbecauseitistough.D、D
最新回复
(
0
)