单项选择题

A．He lost all his data in his work.
B．He can’t find his data in the computer.
C．He can’t find the phone number of a company.
D．His computer is crashed in the middle of his work.
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单项选择题
A．The woman is complaining about Mary.B．The man has been helping Mary with her studies.C．Mary did better than expected in the team.D．Mary should consider dropping out of the team.
A．The woman is complaining about Mary.
B．The man has been helping Mary with her studies.
C．Mary did better than expected in the team.
D．Mary should consider dropping out of the team.
单项选择题
What can we infer from the passage
A．We have enough written record of our ancestors to prove the identity.
B．Many American slaves got to know who their ancestors were though DNA.
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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