单选题：Which of the following statements is true of the Northern Li

题目分类：理工类
题目类型：单选题
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题目内容：

Which of the following statements is true of the Northern Lights? A．Their movement is slow enough to be observed with the eyes.
B．People cannot see them unless traveling to Alaska or Canada.
C．They are very close to the ground.
D．They are very long and thick.

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答案解析：

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