单项选择题

According to Howard, background music ______.

A．can possibly give people better feelings
B．increases production by 4.5 percent in factories
C．is sometimes very boring to the workers
D．is always faster than any other music

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单项选择题

What kind of class went on the field trip

A．Biology.
B．Photography.
C．Swimming.
D．Painting.

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