单项选择题

What is this passage mainly talking about

A．Worldwide recognition of surveillance.
B．Face recognition technologies and surveillance.
C．Privacy protection and security measures.
D．Different views on face scanning technologies.

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单项选择题

______, John had to stay up for the night to finish his paper.

A．Having not given enough time
B．Having not been given enough time
C．Not having been given enough time
D．Not having given enough time

单项选择题

Which of the following statements is true according to this passage

A．Facial recognition systems may possibly make false matches.
B．T.F. Green International Airport has installed the cameras in 2002.
C．Many other airports are now considering installing the cameras.
D．This technological invention is too expensive to install now.