Gaokao Math Practice Question
1. （5 分） 设集合 $A=\{1,2,3\}, B=\{2,3,4\}$, 则 $A \cup B=（ ）$
- A.$\{1,2,3,4\}$
- B.$\{1,2,3\}$
- C.$\{2,3,4\}$
- D.$\{1,3,4\}$
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