Gaokao Math Practice Question
已知集合 $A=\left\{x \mid x^{2}-2 x>0\right\}, B=\{x \mid-\sqrt{5}<x<\sqrt{5}\}$, 则 （$\qquad$）
- A.$A \cap B=\emptyset$
- B.$A \cup B=R$
- C.$B \subseteq A$
- D.$A \subseteq B$
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