The subject of this passage is the______. Which of the following statements is NOT true according to the passage?

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问题 The subject of this passage is the______.
Which of the following statements is NOT true according to the passage?

选项 A、Geologists know that volcano action is caused by radioactive elements.
B、Geologists know that there is higher temperature within the earth.
C、The real causes of the heat inside the earth have not been found.
D、Scientists have made various guesses about the causes of heat inside the earth.

答案A

解析 根据第1段可知:科学家还不知道火山活动的真正原因,只是对此做出了各种猜测而已。选项A说明地质学家知道火山活动是放射性元素造成的,这就与文章内容不符,所以A是正确答案。
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