单项选择题

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

A. A player of background music.
B. A researcher on the function of background music.
C. A composer of background music.
D. A fan of background music.
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A paper published in the Personality and Social Psychology Bulletin revealed that when people are exposed to smelly scent, they will be more ______.
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According to scientists, many people believe that physical cleanliness is strongly linked to ______.
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