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
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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
A．partlyB．rightC．onlyD．just
A．partly
B．right
C．only
D．just
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