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设集合 $A=\left\{x \mid x^{2}-1>0\right\}, B=\left\{x \mid \log _{2} x>0\right\}$, 则 $A \cap B=$ ( )
A. $\{x \mid x>1\}$     B. $\{x \mid x>0\}$     C. $\{x \mid x<-1\}$     D. $\{x \mid x<-1$ 或 $x>1\}$         
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