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    Our planet is about         years old


    1. A.
      35,000
    2. B.
      4600
    3. C.
      4600 million
    4. D.
      500 million
    C
    句意；我们的星球大约有……的历史了。根据地理知识可知，地球的年龄大约在46亿年。故选C。
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