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 main point of the passage is that ______.

A．background music is a good thing
B．background music is a bad thing
C．it is important to use background music in the right way
D．the Americans are good at using background music

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