单项选择题


A．whose
B．which
C．where
D．that
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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.
单项选择题
If two men suspected for some reason 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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