单项选择题

A．They are tour guides.
B．They are salespersons.
C．They are tourists.
D．They are engineers.
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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.
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.
单项选择题
A．The development of fast food services.B．How McDonald’s became a billion-dollar business.C．The business careers of Mac and Dick McDonald.D．Ray Kroc’s business talent.
A．The development of fast food services.
B．How McDonald’s became a billion-dollar business.
C．The business careers of Mac and Dick McDonald.
D．Ray Kroc’s business talent.
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