单项选择题

People in a large area may possess the same DNA thread because

A．DNA is characteristic of a region.
B．they are beyond doubt of common ancestry.
C．DNA strand has the ability to identify individuals.
D．their unique identification can be provided via DN

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单项选择题

The Molecular Genealogy Research Group is building a database for the purpose of______.

A．offering assistance in working out genealogy-related problems
B．solving many issues without relying on traditional written records
C．providing a pedigree chart of at least four generations in the world
D．confirming the assumption that all individuals are of the same origin