The subject of this passage is the. The best title for the passage is .

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问题 The subject of this passage is the______.
The best title for the passage is ______.

选项 A、The Heat Inside the Earth
B、Volcanoes
C、Radioactive Elements
D、The Melted Rock

答案B

解析根据全文，A、c、D的覆盖面都有局限性，不足以概括本文，因此选B。

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