首页
登录
职称英语
Henry III didn’t know much about biology. He went through six wives back in
Henry III didn’t know much about biology. He went through six wives back in
游客
2023-07-01
7
管理
问题
Henry III didn’t know much about biology. He went through six wives back in the 1500s, looking for one who could bear him a son. Scientists now know that it’s the father’s sperm, not the mother’s egg, which determines whether a baby is a boy or a girl. And last week researchers at the Genetics and IVF Institute, a private fertility (生育能力) center in Virginia, announced a new technique that will allow parents to choose the sex of their baby-to-be, before it has even been conceived. The scientist used a tiny laser detector to measure the DNA in millions of sperm cells as they pass single file through a narrow tube, like cattle being herded through a corral (牲口栏). In a study published last week, "girl sperm," which has more DNA—the genetic material—in each cell, was collected, while "boy sperm" was discarded. And when purified girl sperm was used to impregnate (使受孕) a group of mothers, 15 of 17 resulting babies turned out to be girls.
The researchers say that "sex selection" can also double a mother’s chance of having a son and can be used to avoid genetic diseases that affect only one gender, such as hemophilia (血友病). But some experts, like New York University fertility specialist Dr. Jamie Grifo, worry that sex selection could lead to a kind of in uteri (子宫) discrimination, especially in cultures where sons are considered superior to daughters. "It’s valuing one gender over another," Grifo says. "I don’t think that’s something we should be doing." So far, patients at the institute have been asking for both boys and girls, in order to "balance" their families. And some ethics experts say that’s fine, as long as parents are just looking for a little gender variety. "If you have three boys, and you want a girl," says University of Texas reproductive-law professor John Robertson, "that’s not gender bias at all." [br] The DNAin the sperm cells can be measured _____.
选项
A、in the same way how the cattle are herded
B、when they pass through a tube one behind the other
C、after they pass through a laser tube
D、when they are scanned by a laser detector all at a time
答案
B
解析
推理判断题。解答本题的关键在于堆断single file的意思。该句把精子通过试管的情形与牛群被赶入牲口圈的情形作对比,结合single一词本身的意思,可以推断single file是“一个接一个”的意思,只有选项B能表达这个意思,由此也可否定选项D。选项A最具干扰性,原句是把精子通过试管的情形比作牛群被赶入牲口圈的情形,而选项A说的是测定精子内DNA的方法与放牧的方法相同,显然选项A只是引用了原文的某些词语,但表达的意思与原文却截然不同。
转载请注明原文地址:https://tihaiku.com/zcyy/2798307.html
相关试题推荐
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Nextmonth,NewYorkstudentsingradesthreethrougheightwilltakethest
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
HenryIIIdidn’tknowmuchaboutbiology.Hewentthroughsixwivesbackin
HenryIIIdidn’tknowmuchaboutbiology.Hewentthroughsixwivesbackin
随机试题
LanguageFamiliesAllofthelanguageswithinala
诚然,这是我们祖宗的伟业,也是对世界的贡献;可是我们为什么不去追问刚刚建国二百多年的美国,为什么会在物质丰富和科学发展上,跨越了我们的五千年?鲁迅先生深刻
全球化是描述全球社会时使用的一个术语,即在这个社会中,世界上某一个区域在经济、政治、环境、文化方面发生的事件会很快对世界其他地区的人们产生影响。全球化是通信
下列变量中,属于分类变量的是( )。A.产量 B.收入 C.性别 D.体
油浸变压器在线油色谱检测装置哪些缺陷属于一般缺陷()。(A)装置报警(B
现实地看,近几年快速增长的风电、太阳能光伏发电、生物质能以及发展了20多年的核电
社会服务机构可以运用的主要筹资方法包括()。A.电话劝募 B.项目申请 C
(2017年真题)同等数量的货币或现金流在不同时点的价值是不同的。()
完形一顿悟说认为完形是一种{pz_填空},是对事物关系的认知。
疏浚工程中局部欠挖出现()情况时,应进行返工处理。A.欠挖厚度大于设计水深的5%
最新回复
(
0
)