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
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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