单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Husband and wife.
B．Teacher and student.
C．Policeman and driver.
D．Mother and son.

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You can get evacuation details through the ways provided by the website of Las Vegas though it doesn’t disclose the details due to ______.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。