段5：①But some observers are skeptical. ②“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. ③He notes that each individual has many ancestors—numbering in the hundreds just a few centuries back. ④Yet most ancestry testing only considers a single lineage, either the Y chromosome inherited through men in a father’s line or mitochondrial DNA, which is passed down only from mothers. ⑤This 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.
28.Skeptical observers believe that ancestry testing fails to
[A]trace distant ancestors.
[B]rebuild reliable bloodlines.
[C]fully use genetic information.
[D]achieve the claimed accuracy.
答案：D
问：根据原文中的哪句话可以得出28题的正确答案？
A : 段5句②
B : 段5句④
C : 段5句⑤
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