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
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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单项选择题
The teachers and the parents are unaware that the children are exposed to bad habits.
A) 老师和家长都清楚地意识到这些孩子们受到了坏习惯的影响。
B) 老师和家长都清楚地意识到坏习惯暴露在孩子们的面前。
C) 老师和家长都不知道这些孩子们受到了坏习惯的影响。
D) 老师和家长都不知道坏习惯暴露在孩子们的面前。
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