单项选择题 A. Competing ExplanationsB. Unknown AttacksC. Mysterious ExplosionD. Star WarE. Importance of Finding EvidenceF. Explanation that Worries ScientistsParagraph 2
单项选择题 The word "towering" in Paragraph 1 means_____
单项选择题 Something destructive could happen to a star that gets too close to a black hole. Which of the following destructive statements is NOT mentioned in the passage