单项选择题A．They find these stories interesting.B．They can learn, how to write such stories.C．These stories are written by a famous doctor.D．The stories are on their reading list.

单项选择题A．They were sold to people before necessary facilities were installed.B．They were usually not large enough to accommodate big families.C．They were mostly inhabited by people who did .not earn much.D．They provided playgrounds for children on the top of the buildings.