Gaokao Math Practice Question
1. (5 分) 已知集合 $A=\{1,2,3,4\}, B=\left\{x \mid x=n^{2}, n \in A\right\}$, 则 $A \cap B=(\quad)$
- A.$\{1,4\}$
- B.$\{2,3\}$
- C.$\{9,16\}$
- D.$\{1,2\}$
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