In Paragraphs 1 and 2, the text shows PTK’s ______. Skeptical observers believe that ancestry testing fails to ______.

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问题 In Paragraphs 1 and 2, the text shows PTK’s ______.
Skeptical observers believe that ancestry testing fails to ______.

选项 A、trace distant ancestors
B、rebuild reliable bloodlines
C、fully use genetic information
D、achieve the claimed accuracy

答案D

解析 本题问的是:持怀疑态度的观察者认为血统鉴定未能怎么样?各选项的意思分别是:A.追溯到远祖;B.重建可信赖的血统;C.充分利用遗传信息;D.达到声称的准确性。文章第五段指出那些声称正在做血统鉴定的人们所宣扬的血统鉴定的精确度其实是虚假的。由此可以得出选项D为正确答案。而其余三个选项都是血统鉴定未能达到声称的准确性的具体表现,只是它的细节,故不可选。
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