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

A．His roommate is noisy.
B．He isn’t speaking to his roommate.
C．He does not like his roommate.
D．He doesn’t know his roommate very well.

A．Teotihuacan, once the home of 200,000 people, was the center of a large empire.
B．Many archaeologists are fascinated by the ruins of a pre-Columbia city called Teotihuacan.
C．Teotihuacan, once a major metropolitan area, was destroyed by an invasion.
D．A still unsolved mystery is why the people of Teotihuacan suddenly abandoned their city.