2. 外语
  3. A. he did not observe the sun carefully enough B. he could not see its curve C. the sun, the moon and the stars seemed to move a

A. he did not observe the sun carefully enough B. he could not see its curve C. the sun, the moon and the stars seemed to move a

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问题 A. he did not observe the sun carefully enough
B. he could not see its curve
C. the sun, the moon and the stars seemed to move around it
D. the earth circles around the sun
E. it looked like that at night
F. it has power over life on earth
Early astronomers believed that the sky was a crystal shell or series of crystal shells because______.
选项
答案E
解析 根据题干线索词a crystal shell可将原文定位至第五段第三、四句Some early astronomers(天文学家)believed the sky was a crystal shell or series of crystal shells，one inside the other．They believed this because that is what the night sky looked like．选项E是对原文的同义改写，故E为正确答案。
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