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  3. A. Help to detect a suspect B. Discover the potential health problems earlier C. Reveal the unknowns of the family D

A. Help to detect a suspect B. Discover the potential health problems earlier C. Reveal the unknowns of the family D

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问题     A. Help to detect a suspect
    B. Discover the potential health problems earlier
    C. Reveal the unknowns of the family
    D. Have an impact on your ability to get insurance
    E. Lead the policemen to wrong you as a criminal
    F. Assist to find your half-brother
    G. Expose your ancestors
    If you send your DNA to two different companies to find out your ancestry, you may end up with two different results. That’s because there’s no certification required for DNA-testing companies, and their methods aren’t independently validated, says Tufts University professor Sheldon Krimsky, PhD, board chair of the Council for Responsible Genetics. "They may get the basic idea correct—that you are a little less than half northern European, for example," he says. "But when they say you’re 30 percent from here and 60 percent from there, it’s a statistical guess based on their own proprietary database and the statistical method they use."
    Your results will be less precise if you’re not European. The more people from your ancestral region in a company’s database, the more accurate your results will be, says Hank Greely, director of the Center for Law and the Biosciences at Stanford Law School. Many Americans have northern and western European ancestry, and some evidence indicates they’re more likely to use DNA testing. "Even results from southern and eastern Europe aren’t as accurate," Greely says. If you are Native American or African American, no DNA test can tell you what tribe your ancestors belonged to. Testing companies that claim they can misleading you, says Greely. Despite the accuracy problem, At-Home DNA Tests exert surprising influences on our life.
    【R1】________
    You can find out your risk of diseases such as cancer and Alzheimer’s from an at-home DNA test kit, but a laboratory certified to do medical testing will give you much more conclusive results. One small study found that 40 percent of at-home test kits were wrong about predicting genetic abnormalities. That said, many doctors support at-home testing so people can take preventive steps sooner.
    【R2】________
    The results of your genetic testing could affect your ability to get insurance. While federal law prohibits health insurers from denying coverage based on genetic test results, the law does not apply to life, disability, and long-term care insurance. In most states, an insurance company can legally ask for the results of your DNA test. "If you’re planning to get long-term-care or life insurance, buy it before you get tested," Greely suggests.
    【R3】________
    Law-enforcement agencies are increasingly using family tree DNA databases to solve crimes, as was done in the arrest of a former police officer accused of being the Golden State Killer. California detectives took the DNA results from various crime scenes, looked for partial matches on a public genealogy database, and eventually found their man.
    【R4】________
    Of course, that also means a relative’s DNA could make you a suspect—even if you’re innocent. Exhibit A: New Orleans filmmaker Michael Usry was identified as a murder suspect based on a genetic sample his father had submitted years earlier as part of a church genealogy project. Usry was eventually cleared after further testing showed his DNA didn’t match the evidence from the crime scene. Privacy advocates oppose the government’s ability to use familial DNA, and Maryland and Washington, DC, prohibit its use in criminal cases.
    【R5】________
    Your DNA testing may reveal family secrets. In just one among many such stories, a 23andMe user who tested himself and his parents for a class he was teaching on genetics unearthed a half brother. The revelation "uncorked" emotions with his family, he wrote on vox.com, and his parents eventually divorced.
【R1】
选项
答案B
解析 本段首句提到find out your risk of diseases such as cancer and Alzheimer’s from an at-home DNA test kit (通过家庭DNA检测试剂盒找出你患癌症和阿尔茨海默氏症等疾病的风险)。强调潜在疾病可以通过家庭DNA检测来发现。此外，末句提到many doctors support at-home testing so people can take preventive steps sooner. (许多医生还是支持在家做检测，这样人们就可以更快地采取预防措施)。浏览小标题可知，只有B项Discover the potential health problems earlier(及早发现潜在的健康问题)符合本段大意，故为正确答案。
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