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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单项选择题

The studies of the American company show that ______.

A．the wrong kind of" Muzak" could be harmful
B．"Muzak" is not good in factories
C．"Muzak" is welcome everywhere
D．"Muzak" can cure sleeplessness

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