单项选择题

A．A language lab and videos.
B．Video and tape recorders.
C．Computers and recorders.E) A language lab and computers.
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单项选择题
A．A salesperson.B．An experienced sales manager.C．A senior business executive.D．A government administrator.
A．A salesperson.
B．An experienced sales manager.
C．A senior business executive.
D．A government administrator.
填空题
What is the passage mainly concerned with
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