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
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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.
单项选择题
A．everB．beforeC．onceD．never
A．ever
B．before
C．once
D．never
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