Gaokao Math Practice Question
已知集合 $A=\{x \mid x<1\}, B=\left\{x \mid 3^{x}<1\right\}$ ，则 （$\qquad$）
- A.$A \cap B=\{x \mid x<0\}$
- B.$A \cup B=R$
- C.$A \cup B=\{x \mid x>1\}$
- D.$A \cap B=\varnothing$
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