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
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
单项选择题
If the temperature at the earth's surface is twenty degrees Fahrenheit, the temperature in a coal mine 500 feet below the surface would, in degrees, be _____________.
A．50
B．40
C．30
D．120
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