单选题：Questions 12 to 15 are based on the conversation you have ju

题目内容：

Questions 12 to 15 are based on the conversation you have just heard. A．Social status.
B．Income.
C．Working conditions.
D．Types of work.

参考答案：

答案解析：

Questions 9 to 12 are based on the conversation you have jus

Questions 9 to 12 are based on the conversation you have just heard.A．It preven

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