Gaokao Math Practice Question
2. (5 分) 已知集合 $A=\{1,2,3\}, B=\{x \mid （ x+1)(x-2)<0, x \in Z\}$, 则 $A \cup B$ 等于 $(\quad)$
- A.$\{1\}$
- B.$\{1,2\}$
- C.$\{0,1,2,3\}$
- D.$\{-1,0,1,2,3\}$
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