单项选择题

If two men suspected for some reason that they have a common ancestor,______.

A．we can decide according to their family tree
B．we can find the truth from their genetic markers
C．we can compare the differences in their Y chromosome
D．we can look for written records to prove their relationship
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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
单项选择题
The possible research of family trees is based on the fact that ______.
A．genetics has achieved a breakthrough
B．genetic information contained DNA can be revealed now
C．each individual carries a unique record of whom he is and how he is related to others
D．we can use DNA to prove how distant an individual is to a family, a group or a population
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