单项选择题

______ is written by Theodore Dreiser.

A．A Psalm of Life
B．Sister Carrie
C．Moby Dick
D．Emma
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单项选择题
Which of the following expressions about the Visionics Corp's face scanning system is NOT true
A．It can't replace the law enforcement.
B．It has been improved.
C．It has been widely used in entertainment districts.
D．The database of the system contains photographs of a limited amount of peopl
单项选择题
The passage mainly discusses ______.
A．the face-scanning systems
B．fingerprint systems
C．how to identify a person
D．the problem of biometrics
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