单项选择题

A．The driver.
B．The central computer.
C．The car itself.
D．The authority.
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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．Seldom use a nickname.B．Tell online friends the name of your school.C．Always be careful about meeting online acquaintances.D．Give out some of your personal information.
A．Seldom use a nickname.
B．Tell online friends the name of your school.
C．Always be careful about meeting online acquaintances.
D．Give out some of your personal information.
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