单选题：Why can't you see light when you look at a black hole?

题目分类：英语
题目类型：单选题
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题目内容：

Why can't you see light when you look at a black hole? A．Because most black holes are so far away.
B．Because the gravity of a black hole is so strong that it sucks the light inward.
C．Because as the star's gases burn, it stops giving off heat and light.
D．Because as a star cools, its outer layers pull in toward its center.

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