单选题：According to the passage, which of the following is true?___

题目分类：理工类
题目类型：单选题
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题目内容：

According to the passage, which of the following is true?__________. A．All people only buy things they need.
B．Both business people and advertisers increase sales through using psychology.
C．Scientists understand psychology better than business people.
D．Compulsive spenders can never get any help to solve their problems.with money.

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答案解析：

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