单项选择题

The underlined word "it" in the fourth paragraph refers to ______.

A．a selling point
B．the company name
C．a great demand for health foods
D．the manufacturing of green products
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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
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