单项选择题


A．late
B．early
C．previous
D．prior
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单项选择题
A．whoseB．whichC．whereD．that
A．whose
B．which
C．where
D．that
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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