单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.
Why did the building get sick

A．The building needs more breath.
B．Too many pollutants and moisture.
C．The building has been overused.
D．People don’t take good care of it.

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单项选择题

单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. Why did the building get sick 您的浏览器不支持 audio 元素。