若 $2^{x}-2^{y}<3^{-x}-3^{-y}$, 则 ($\quad$)
Gaokao · Math · previous-year question
- A.$\ln (y-x+1)>0$
- B.$\ln (y-x+1)<0$
- C.$\ln |x-y|>0$
- D.$\ln |x-y|<0$
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