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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单项选择题
Which of the following statements about the use of finger-scan devices for school lunch lines is NOT correct
A．It makes the school lunch lines move faster.
B．The fingerprint images of the student are recorded.
C．Some parents feel uncomfortable about the devices.
D．Those who needn't pay for their meals no longer get embarrasse
单项选择题
The technology in the second paragraph refers to ______.
A．face-scanning systems
B．fingerprint systems
C．gummy dummies
D．biometrics
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