9. 听材料,回答问题。
(1) At least how many times has the man been to the city?
A . Once.
B . Twice.
C . Three times.
(2) What can we learn from the conversation?
A . The woman thinks it worthwhile to tear down the old buildings.
B . The city looks quite different from other cities in the world.
C . Many tall buildings have taken the place of the old buildings in the city.
(3) What is the woman probably doing?
A . Telling Tom their plan of building the city.
B . Showing Tom around the city.
C . Asking Tom how to solve the problem of large population.