单项选择题

Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now, listen to the conversation.
Where in the workplace might ozone be a problem

A．At a computer terminal.
B．On the elevator.
C．Near the copy machines.
D．In the parking lot.

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单项选择题

单项选择题

Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now, listen to the conversation. Where in the workplace might ozone be a problem 您的浏览器不支持 audio 元素。