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[听力原文] The Credit Card in the U. S. Today,......

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单项选择题
The cause for the heat in the interior of the earth is ______.
A．radioactive element
B．the great pressure of the earth
C．not determined
D．volcanic action in the interior of the earth
单项选择题
The subject of this passage is the ______.
A．formulation of volcanoes
B．results of volcanic actions
C．work of geologists
D．interior of the earth
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