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

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热门试题

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