38. How is a black hole formed?
(A) When a star explodes during a supernova.
(B) When a star gets too close to another star.
(C) When a star absorbs too much light.
(D) When a star collides with the Sun.
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題目分析： 題目要求根據文章判斷黑洞是...
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38.黑洞是如何形成的？(A) 當恆星在...
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