单项选择题

According to Mr. Bacon, people keep snakes because ______.

A．they like them as pets
B．they are curious of them
C．they use them to frighten other people
D．they keep them to do research
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单项选择题
Hamburger places usually play fast background music because ______.
A．they think that will make the attendants work faster
B．they believe fast music can make people eat more
C．it shortens eating time to allow more customers coming and going
D．hamburgers will become more popular
单项选择题
Howard is probably ______.
A．an orchestra conductor
B．a music fan
C．a sales manager in a music company
D．a background music composer
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