段6：①Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared. ②Databases used by some companies don’t rely on data collected systematically but rather lump together information from different research projects. ③This 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. ④In addition, the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.
29.In the last paragraph, a problem commercial genetic testing faces is
[A]disorganized data collection.
[B]overlapping database building.
[C]excessive sample comparison.
[D]lack of patent evaluation.
答案：A
问：根据原文中的哪句话可以判断出D选项错误？
A : 段6句②
B : 段6句③
C : 段6句④
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