Gaokao Math Practice Question
1.（5 分）已知集合 $A=\{x \mid x<1\}, B=\left\{x \mid 3^{x}<1\right\}$, 则（）
- A.$A \cap B=\{x \mid x<0\}$
- B.$A \cup B=R$
- C.$\mathrm{A} \cup \mathrm{B}=\{\mathrm{x} \mid \mathrm{x}>1\}$
- D.$A \cap B=\varnothing$
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