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.

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　　①Among 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.

　　②DNA testing is also the latest rage among passionate genealogists—and supports businesses that offer to search for a family's geographic roots.

　　参考译文

　　①其中最受欢迎的是父亲身份和亲缘身份的测试，被收养的孩子可以用它找出他们的血亲，而家庭成员也可以用它来找出送去寄养的孩子的下落。

　　②DNA 测试最近也受到狂热系谱专家的追捧，同时也为一些以给家族寻根为生意的公司提供技术支持。