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1. What do the speakers mainly discuss?CorrectIncorrect
2. According to the discussion, what can happen when two galaxies collide? Click on 2 answers.CorrectIncorrect
3. According to the discussion, what have astronomers concluded from computer models?CorrectIncorrect
4. Listen again to part of the discussion. Then answer the question.
What does the tutor imply?CorrectIncorrect
5. Why does the student say this:CorrectIncorrect