单选题：Paragraph 3__________

题目分类：理工类
题目类型：单选题
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题目内容：

Paragraph 3__________ A．Is there proof that black holes really exist?
B．What are different types of black holes?
C．How are black holes formed?
D．How were black holes named?
E．What happens to the objects around a black hole?
F．What are black holes made of?

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答案解析：

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