题目

25.It is a wise father that knows his own child,but today a man can boost his paternal（fatherly）wisdom–or at least confirm that he's the kid's dad.All he needs to do is shell our30 for paternity testing kit（PTK）at his local drugstore–and another120 to get the results.More than 60,000 people have purchased the PTKs since they first become available without prescriptions last years,according to Doug Fog,chief operating officer of Identigene,which makes the over-the-counter kits.More than two dozen companies sell DNA tests Directly to the public,ranging in price from a few hundred dollars to more than2,500.Among the most popular:paternity and kinship testing,which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption.DNA testing is also the latest rage among passionate genealogists—and supports businesses that offer to search for a family's geographic roots.Most tests require collecting cells by swabbing saliva in the mouth and sending it to the company for testing.All tests require a potential candidate with whom to compare DNA.But some observers are skeptical,"There is a kind of false precision being hawked by people claiming they are doing ancestry testing,"says Trey Duster,a New York University sociologist.He notes that each individual has many ancestors-numbering in the hundreds just a few centuries back.Yet most ancestry testing only considers a single lineage,either the Y chromosome inherited through men in a father's line or mitochondrial DNA,which is passed down only from mothers.This DNA can reveal genetic information about only one or two ancestors,even though,for example,just three generations back people also have six other great-grandparents or,four generations back,14 other great-great-grandparents.Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared.Databases used by some companies don't rely on data collected systematically but rather lump together information from different research projects.This means that a DNA database may have a lot of data from some regions and not others,so a person’s test results may differ depending on the company that processes the results.In addition,the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.27.PTK is used to__________. A.B. A. locate one's birth place C.D. B. promote genetic research E.F. C. identify parent-child kinship G.H. D. choose children for adoption

25.

It is a wise father that knows his own child,but today a man can boost his paternal（fatherly）wisdom–or at least confirm that he's the kid's dad.All he needs to do is shell our$30 for paternity testing kit（PTK）at his local drugstore–and another$120 to get the results.More than 60,000 people have purchased the PTKs since they first become available without prescriptions last years,according to Doug Fog,chief operating officer of Identigene,which makes the over-the-counter kits.More than two dozen companies sell DNA tests Directly to the public,ranging in price from a few hundred dollars to more than$2,500.Among the most popular:paternity and kinship testing,which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption.DNA testing is also the latest rage among passionate genealogists—and supports businesses that offer to search for a family's geographic roots.Most tests require collecting cells by swabbing saliva in the mouth and sending it to the company for testing.All tests require a potential candidate with whom to compare DNA.But some observers are skeptical,"There is a kind of false precision being hawked by people claiming they are doing ancestry testing,"says Trey Duster,a New York University sociologist.He notes that each individual has many ancestors-numbering in the hundreds just a few centuries back.Yet most ancestry testing only considers a single lineage,either the Y chromosome inherited through men in a father's line or mitochondrial DNA,which is passed down only from mothers.This DNA can reveal genetic information about only one or two ancestors,even though,for example,just three generations back people also have six other great-grandparents or,four generations back,14 other great-great-grandparents.Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared.Databases used by some companies don't rely on data collected systematically but rather lump together information from different research projects.This means that a DNA database may have a lot of data from some regions and not others,so a person’s test results may differ depending on the company that processes the results.In addition,the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.27.PTK is used to__________.

  • A.
  • B. A. locate one's birth place
  • C.
  • D. B. promote genetic research
  • E.
  • F. C. identify parent-child kinship
  • G.
  • H. D. choose children for adoption

题目解答

答案

正确答案： C

您的答案：

本题解析：

文章第一段段首在引出PTK时说“知道自己孩子的父亲是很英明的，但我们能够提升这种智慧——至少我们能确定他是孩子的爸爸。他所需要做的是花费30美元在当地药店做一个PTK测试”，由此，显然PTK是用于父子关系的检查手段，故答案为C。A和C的内容只是借助PTK可以实现的手段，不是根本；B则是文章中无中生有的内容。

解析

本题考查根据上下文确定关键词语的具体用途。文章第一段明确提到PTK（Paternity Testing Kit，亲子鉴定试剂盒）的直接用途是确认父子关系。解题关键在于抓住段落中与PTK相关的描述，排除干扰选项。

选项分析

A. locate one's birth place
文章中提到DNA测试可用于追踪地理根源（如“search for a family's geographic roots”），但PTK的直接用途是亲子鉴定，而非定位出生地。

B. promote genetic research
PTK属于商业用途的DNA测试，而非推动科学研究。文章中未提及PTK与基因研究的直接关联。

C. identify parent-child kinship
第一段明确说明PTK用于“paternity testing”，即确认父子关系。例如：“confirm that he's the kid's dad”直接对应选项C。

D. choose children for adoption
文章提到家庭可用DNA测试追踪被收养的孩子，但PTK本身是用于确认已存在的亲子关系，而非“选择”孩子收养。