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 DNA

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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 in DNA can be revealed now
C．each individual carries a unique record of who 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

单项选择题

Which of the following CANNOT be inferred from the passage

A．We are a walking, living, breathing record of our ancestors.
B．Many American slaves did not know who their ancestors were.
C．An adopted child generally lacks enough information to prove his identity.
D．Molecular genealogy can be used to prove a relationship between individuals.

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