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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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
单项选择题
The cause for the heat in the interior of the earth is _____________.
A．not determined
B．the great pressure of the earth
C．radioactive elements
D．the heat remaining from the formation of the earth
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