单选题：According to the passage, the price system is related prima

题目内容：

According to the passage, the price system is related primarily to A．labor and education.
B．transportation and insurance.
C．products and services.

参考答案：

答案解析：

QuestionsRead the article below about price system.For each

QuestionsRead the article below about price system.For each question (23-28)

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