单项选择题

What did the Super Bowl attendees NOT do in their reaction to the installation of scanners

A．Covering their faces with something.
B．Opposing the scanning by protesting.
C．Making obscene gestures at the cameras.
D．Wearing masks when attending the gam

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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.

单项选择题

Human beings have used tools for a long time, ______ they would not have been able to develop their intelligent so fast.

A．doubtlessly
B．therefore
C．otherwise
D．consequently