单项选择题

In order to establish the "fix" or precise location of a ship, the navigator must know________.

A．his latitude
B．his longitude
C．local time
D．both his latitude and longitude
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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
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
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