单项选择题


A．Supervisor and student.
B．Colleagues.
C．Editor and contributor.
D．Customer and typist.
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单项选择题
A．To save money.B．To avoid the new tax.C．To be more creative.D．To attract more audiences.
A．To save money.
B．To avoid the new tax.
C．To be more creative.
D．To attract more audiences.
单项选择题
A．The first wave is often the largest.B．The wave following large volume of water is usually not very long but very tall.C．The wave of tsunamis can spread across the sea in all directions.D．The wave of tsunamis usually travels at a lower speed at the beginning.
A．The first wave is often the largest.
B．The wave following large volume of water is usually not very long but very tall.
C．The wave of tsunamis can spread across the sea in all directions.
D．The wave of tsunamis usually travels at a lower speed at the beginning.
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