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
51
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
【C1】
选项
答案
I
解析
此处应为单数名词。根据该句中的blind一词可以知道句中提到的condition其实是一种“疾病”,“不正常的情况”,显然disorder为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/kHa7777K
0
大学英语四级
相关试题推荐
A、Itissignedbythestategovernment.B、Itcouldraisemoneyfromparents.C、Ithasbeendrawnuptoprotectchildren.D、Itco
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
Keepingafullsocialcalendarmayhelpprotectyoufromdementia(痴呆症),researcherssaidonMonday.【C1】______activepeople
Pub-talkA)Pub-talk,themostpopularactivityinallpubs,isanativedialectwithitsowndistinctivegrammar.Thereare
TipsforThoseWhoTravelAloneA)Whenitcomestotraveling,sometimestakingajourneyalonecanbegreat.Travelingalon
ANiceCupofTeaTheLegendaryOriginsofTeaA)ThestoryofteabeganinancientChinaover5,000yearsago.Accordingto
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow,anger,orjoy,typicallymakeAmericansfeeluncom
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow,anger,orjoy,typicallymakeAmericansfeeluncom
Duringthe1992presidentialcampaign,HillaryRodhamClintonobserved,"Ourlivesareamixtureofdifferentroles.Mostofus
Costly—sometimesabusive—creditcardsarebleedingmillionsofborrowerswhodidn’tknowwhattheyweregettinginto.Thebo
随机试题
A.心B.肝C.脾D.肺能让水谷精微灌四傍的是
女性,28岁。尿频、尿痛、尿急,肾区叩击痛,尿镜检:白细胞满视野、红细胞10~20/高倍视野,肾功能正常。此时最佳的处理为
脾为气血生化之源的理论基础是
关于流产的治疗,下列哪项不正确
甲乙丙三人合伙开办电脑修理店,店名为“一通电脑行”,依法登记。甲负责对外执行合伙事务。顾客丁进店送修电脑时,被该店修理人员戊的工具碰伤。丁拟向法院起诉。关于本案被告的确定,下列哪一选项是正确的?(2010年卷三40题)
将每个方案在不同自然状态下的最大收益值定为理想目标的决策方法是( )。
()可作为减肥食品的原料。
NewChangesinAmericanLifeOnceitwaspossibletodefinemaleandfemaleroleseasilybythedivisionoflabor.Menworke
TheWritingsectiontestsyourabilitytowriteessaysinEnglishsimilartothosethatyouwouldwriteincollegecourses.
A、Toberelaxed.B、Tobreathedeeply.C、Toforgetbadmemories.D、Toavoidnervousness.A
最新回复
(
0
)