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

A．stores will make noise for the ancient city
B．the antique has a significant role in Mexico
C．mysterious inhabitants had lived there until the Spanish arrived
D．the pyramid was used for ceremony

A．They are big and capable of attacking.
B．They serve their owners as friends and guards.
C．They make most people afraid.
D．They are easy to take care of.