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

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 game.

单项选择题

This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most important.

A．is
B．being
C．has been
D．of