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
单项选择题
A．Because it stimulates your nerve activity.B．Because it keeps you calm.C．Because it strengthens your memory.D．Because it improves your problem solving strategies.
A．Because it stimulates your nerve activity.
B．Because it keeps you calm.
C．Because it strengthens your memory.
D．Because it improves your problem solving strategies.
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