Gaokao Math Practice Question
1. （5 分）已知集合 $A=\{1,2,3\}, B=\left\{x \mid x^{2}<9\right\}$, 则 $A \cap B=（ \quad ）$
- A.$\{-2,-1,0,1,2,3\}$
- B.$\{-2,-1,0,1,2\}$
- C.$\{1,2,3\}$
- D.$\{1,2\}$
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