Complete the diagram below. Choose the correct letter A-E from the box below. Write your answers in boxes 19-23 on your

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问题     Complete the diagram below.
    Choose the correct letter A-E from the box below.
    Write your answers in boxes 19-23 on your answer sheet.

    A.Gliese581c
    B.Gliese581d
    C.Gliese581e
    D.Gliese 581g
    E.Earth
What do astronomers now realize are not rare occurrences?

选项

答案habitable planets

解析
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