Our planet is about         years old


  1. A.
    35,000
  2. B.
    4600
  3. C.
    4600 million
  4. D.
    500 million
C
句意；我們的星球大約有……的歷史了。根據(jù)地理知識(shí)可知，地球的年齡大約在46億年。故選C。
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