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．She will not have time to prepare lunch.B．She has to cancel her plan to have lunch with the man.C．She does not remember discussing the matter.D．She would rather wait until tomorrow to decide.
A．She will not have time to prepare lunch.
B．She has to cancel her plan to have lunch with the man.
C．She does not remember discussing the matter.
D．She would rather wait until tomorrow to decide.
单项选择题
A．Salt.B．Chemical pollutants.C．Germs.D．Minerals.
A．Salt.
B．Chemical pollutants.
C．Germs.
D．Minerals.
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