各项是正数的等比数列{a n }中,a 2 , 1 2 a 3 ,a 1 成等差数列,则数列{a n }公比q=______.
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【单选题】听力原文:M: Do you think home video players will replace movie theatres and force them out of the entertainment business? W: Movie's certainly faced with the grave challenge from the DVD industry,that's w...
A.
It is being forced out of the entertainment industry.