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.
A．He is confident that the dating is accurate.
B．He is sure the dating will be revised in the future.
C．He is surprised that the dating remains inconclusive.
D．He believes that additional testing will be needed to confirm the dating.
A．By comparing it to similar devices used 1,000 years later.
B．By using a kind of rays to see inside of the mechanism.
C．By referring to ancient Greek writings about the mechanism.
D．By consulting with colleagues in the field of physics.
A．To point that the Botai people sometimes did not have enough food.
B．To compare the physical features of domesticated and wild horse.
C．To prove that the horses of the Botai people were domesticated.
D．To emphasize that horse milk was popular in some ancient societies.