Paragraph 1__________

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?

24、 Paragraph 2__________

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?

25、 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?

26、 Paragraph 4__________

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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