单项选择题

For many years it was thought that it was enough to produce goods and supply services.

A) 许多年以来，它被认为是生产商品和提供服务。
B) 许多年以来，人们认为应该生产足够多的商品和提供足够的服务。
C) 许多年以来，人们以为生产商品和提供服务就足够了。
D) 许多年以来，人们认为应该有好的商品和服务。
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单项选择题
Why did ancient Chinese coins have a square hole in the center
A．Because people want to make it look more beautiful.
B．Because it would be lighter to carry away.
C．Because it would be easier to put them together and carry them around.
D．Because it would save the cost which they were made from.
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According to the passage, if a scientist wants to predict the way consumers spent their money, be must ______.
A．study consumer behavior
B．obtain data on the incomes of consumers
C．get data on money spending motives
D．do all of the above
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