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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 tha

It is a wise father that knows his own child, but today a man can boost his paternal (fatherly) wisdom — or at least confirm tha

admin2017-07-09  7
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 to 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 year, according to Doug Fogg, chief operating officer of Identigene, which makes the over-the-counter(无需处方的) 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(亲属关系) 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 (系谱学者)— and supports businesses that offer to search for a family’s geographic roots.
    Most tests require collecting cells by swabbing 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’s a kind of false precision being hawked by people claiming they are doing ancestry testing," says Troy 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(染色体) inherited through men in a father’s line or mitochondrial(线粒体的) 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.
An appropriate title for the text is most likely to be______.
选项 A、Fors and Againsts of DNA Testing
B、DNA Testing and Its Problems
C、DNA Testing Outside the Lab
D、Lies Behind DNA Testing
答案B
解析 主旨题。文章前四段对DNA技术的测试方法和测试目的以及它如何变得流行起来作了说明，后两段从observers和critics的观点出发，说明了DNA测试存在的问题。可见，B项较全面地概括了文章涉及的主要内容，为正确答案。
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