单项选择题

A navigator's chronometer will always show _____________.

A．Greenwich time
B．noon time
C．local time
D．sun time
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单项选择题
In relation to the earth, the sun will move _____________.
A．7,000 miles per hour
B．fifteen degrees in one hour
C．1/48th of the world's circumference
D．twice as far as Polaris
单项选择题
In order to determine latitude, the navigator must know
A．Greenwich time and local time
B．a good deal of mathematics
C．the angle between Polaris and the horizon
D．his precise location
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