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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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
单项选择题
The subject of this passage is the _____________.
A．interior of the earth
B．results of volcanic action
C．work of geologists
D．formation of volcanoes
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