单项选择题

A．Good, but needs improvement.
B．It’s good enough.
C．Good, but it can make people lazy.
D．Good, but the computers are likely to be attacked by hackers from the Internet.
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单项选择题
A．They are tour guides.B．They are salespersons.C．They are tourists.D．They are engineers.
A．They are tour guides.
B．They are salespersons.
C．They are tourists.
D．They are engineers.
单项选择题
A．Workers.B．Students.C．Engineers.D．Businessmen.
A．Workers.
B．Students.
C．Engineers.
D．Businessmen.
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