单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．The history of background music.
B．The function of background music.
C．The way background music is played.
D．The popularity of background music among workers.
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单项选择题
A．Show the man how to use the copy machine.B．Copy the message for the man.C．Inform the man about the policy.D．Call the man after she talks to the students,
A．Show the man how to use the copy machine.
B．Copy the message for the man.
C．Inform the man about the policy.
D．Call the man after she talks to the students,
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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