Men who made the early maps showed that the center of the earth as _______.

A．Fear keeps people from doing things.
B．Early sailors could not read maps.
C．Tile oceans of the world were once dark.
D．The monsters in the oceans were really terrible.

A．sailors thought the world was flat
B．the man who made maps had seen one-eyed monsters
C．easily sailing ships were made of metal
D．the water in the sea was boiling a long time ago