单项选择题

A．One month.
B．One week.
C．Two weeks.
D．Two months.
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单项选择题
The fact that everyone’’s fingerprint is unique_______.
A．is only known to those who got a Ph.D. degree
B．is only understood by those who attended the scientific lectures on genetics
C．is widely known to the common people
D．both A and B
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