首页
登录
职称英语
Once they decided to have children, MiShel and Carl Meissner tackled the nex
Once they decided to have children, MiShel and Carl Meissner tackled the nex
游客
2023-07-02
42
管理
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 [br] 【C4】
选项
答案
C
解析
此处应为动词过去式。本句的内容表明实验室的启动“标志”着该公司的第一次扩张,因此答案为marked。
转载请注明原文地址:https://tihaiku.com/zcyy/2801724.html
相关试题推荐
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
Tallmenaremorelikelytohavechildrenthantheirverticallychallengedf
Tallmenaremorelikelytohavechildrenthantheirverticallychallengedf
Tallmenaremorelikelytohavechildrenthantheirverticallychallengedf
Tallmenaremorelikelytohavechildrenthantheirverticallychallengedf
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
Childrenwhospendmorethantwohoursadayatacomputerorwatchingtelev
随机试题
尤其在乡间,上千年来人们一直以不变的方式生活着。种植庄稼和葡萄,酿酒和饮酒,喂牛和挤奶,锄草和栽花;在周末去教堂祈祷和做礼拜,在节日到广场拉琴、跳舞和唱歌……(
______oftheburden,thekitewentupintheair.A、TobefreeB、TofreeC、Freein
下列不能成为公告的发文机关的是()。A.国务院 B.各省市人民政府 C.全
建筑安装工程费中的规费包括( )。A.养老保险费 B.失业保险费 C.医疗
关于税务行政许可实施程序听证规定的说法,正确的有( )。A.税务行政机关一般可视
监控设施工程属于机电工程中的()。A.单项工程 B.单位工程 C.分部工程
为了正确分析判断经济社会发展的国内、国际环境,反映国内外市场需求和趋势,制定科学
社会主义的道德建设的核心是( )。A.为人民服务 B.集体主义 C.诚实守
分布式RTU的主要特点是()。 A.结构简单紧凑; B.采用问答式(Poll
关于刚架桥的说法,正确的是()。A.它是由受压的梁板结构与受弯的柱结合在一起的
最新回复
(
0
)