The subject of this passage is the. The cause for the heat in the interior of the earth is.

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问题 The subject of this passage is the______.
The cause for the heat in the interior of the earth is______.

选项 A、radioactive elements
B、the great pressure of the earth
C、not determined
D、the heat remaining from the formation of the earth

答案C

解析关于地热的成因，首段中介绍了三种理论，然而并未肯定任何一种理论可以单独解释，故A、B、D都应排除。

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