题目内容
It is only space—or thus we think. How can this happen？ __5__
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Astronomers and scientists think that a black hole is __2__a region of
this process of shrinking may be so intense that a black hole results in. Imagine the earth reduced to the __7__size of a marble
as the terms we would normally use to describe a scientific phenomenon __1__are adequate here.
space which matter has fallen and from which nothing can __3__
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