单项选择题

A．Colleagues.
B．Boss-Employee.
C．Student-librarian.
D．Lawyer-Client.
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单项选择题
A．Hospital employees.B．City Hall officials.C．Packer Hall residents.D．The engineering students.
A．Hospital employees.
B．City Hall officials.
C．Packer Hall residents.
D．The engineering students.
单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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