摘要： Astronomers and scientists think that a black hole is a region of space which matter has fallen and which nothing can escape. A. into; from B. towards; towards C. out of; from D. through; through
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Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.
| A．into; from | B．towards; towards |
| C．out of; from | D．through; through |