单项选择题

It becomes clear from the text that the driving force(动力)behind green products is ______.

A．public caring for the environment
B．companies' desire for bigger sales
C．new ways of doing business
D．rapid growth of supermarkets
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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
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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