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
What would be the best title for the text
A．Business and People
B．Business Goes Green
C．Shopping Habits Are Changing
D．Supermarkets and Green products
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
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