Gaokao Math Practice Question
设集合 $A=\{1,2\}, B=\{2,4,6\}$, 则 $A \cup B=(\qquad)$
- A.$\{2\}$
- B.$\{1,2\}$
- C.$\{2,4,6\}$
- D.$\{1,2,4,6\}$
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