单项选择题

What would be the best title for the text

A．Business and People
B．Business Goes Green
C．Shopping Habits Are Changing
D．Supermarkets and Green products
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单项选择题
It has been proved that Muzak can ______.
A．improve productivity
B．create a pleasant atmosphere
C．cause an entire factory to sleep
D．all of the above
单项选择题
Which of the following statements is true
A．Background music is only used in the States.
B．Background music is used all over the world except the States.
C．Most shops and restaurants use background music now.
D．It is very difficult to listen to background music.
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