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  3. 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

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

admin2014-02-25  61
问题     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 out $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 Fogg, 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 webbing saliva(唾液)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(世系), either the Y chromosome(染色体)inherited through men in a father’s line or mitochondrial(线粒体)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.
According to the passage, what is PTK used to?
选项 A、To locate one’s birth place.
B、To promote genetic research.
C、To find out if one is the father of a child.
D、To help improve one’s intelligence.
答案C
解析 根据题干中的PTK将本题出处定位于首段。首段首句破折号后提到，这个男人至少可以确认自己是孩子的父亲。紧接着第2句提到，他所要做的就是在附近的药店里花30美元买一个父子关系测试包(PTK)。由此可推断，PTK是检测亲子关系的工具，故答案为C)。首句but后提到，男人可以提升自己的智慧，至少可以确认自己是孩子的父亲，指的是PTK让男人更加了解孩子，而不是能帮助提高人的智力，故排除D)。
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