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
52
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
Mostpeopleoftendreamatnight.Whentheywakeinthemorningtheysaytothemselves,"WhatastrangedreamIhad!Iwonderwh
Keepingafullsocialcalendarmayhelpprotectyoufromdementia(痴呆症),researcherssaidonMonday.【C1】______activepeople
Keepingafullsocialcalendarmayhelpprotectyoufromdementia(痴呆症),researcherssaidonMonday.【C1】______activepeople
GPSA)TheGlobalPositioningSystemisa.space-basedtriangulationsystemusingsatellitesandcomputerstomeasurepositi
GPSA)TheGlobalPositioningSystemisa.space-basedtriangulationsystemusingsatellitesandcomputerstomeasurepositi
It’snosecretthatmanychildrenwouldbehealthierandhappierwithadoptiveparentsthanwiththeparentsthatnaturedealtt
TipsforThoseWhoTravelAloneA)Whenitcomestotraveling,sometimestakingajourneyalonecanbegreat.Travelingalon
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand
随机试题
项目管理信息系统的主要作用是()。
Somepeopleseemtothinkthatsportsandgamesareunimportant.TheyliketowatchTVathome,gotothecinema,orsleep.【21】i
下列不属于儿科护理学范畴的是
骑跨伤所致尿道破裂,其尿道出血的特点是
A.普鲁卡因B.乙醚C.利多卡因D.硫喷妥钠E.布比卡因吸入麻醉,应首选
在我国,课程主要由三部分组成,即()。
至于建筑物之间的组合,即对于空间的处理,我们的祖先更是表现了无比的智慧。院落组织是中国建筑在平面上的特征,无论是住宅、官署、寺院、宫廷、商店、作坊,都是由若干主要建筑物,如殿堂、厅舍,加以附属建筑物,如厢耳、廊庞、院门、围墙等周绕联络而成一院,或若干相连的
下列词语中加下划线字的读音完全相同的一组是:
阅读以下应用程序说明和C程序,将C程序段中(1)—(7)空缺处的语句填写完整。[说明]打保龄球是用一个滚球去打出10个站立的柱,将柱击倒。一局分10轮,每轮可滚球一次或多次,以击倒的柱数为依据计分。一局得分为10轮得分之和,而每轮的得分不
一台PC机的扩展槽中已插入一块D/A转换器模板,其口地址为280H,执行下列程序段后,D/A转换器输出波形是( )。 DAOUT:MOV DX,280H MOV AL,00H LOOP:OUT DX
最新回复
(
0
)