A．In the night.          
B．Every four hours.                        
C．Whenever it wants food.
D．When its blood sugar level sinks.

A．The methods scientists used to reconstruct the Antikythera Mechanism.
B．The influence the Antikythera Mechanism has had on the study of physics.
C．A research project in the combined fields of physics and mathematics.
D．A discovery that challenged an accepted historical view.

A．Dials on the device could be turned to calculate a ship's location at sea.
B．The device was used to operate a larger computing system.
C．A system of gears rotated the images located on the case.
D．Light from the Sun illuminated particular indicators on the case throughout the day.