1. （5 分）设集合 $A=\{1,3,5,7\}, B=\{x \mid 2 \leqslant x \leqslant 5\}$, 则 $A \cap B=(\quad)$
Gaokao · Math · previous-year question
- A.$\{1,3\}$
- B.$\{3,5\}$correct
- C.$\{5,7\}$
- D.$\{1,7\}$
Answer
B. $\{3,5\}$
Explanation
解：集合 $\mathrm{A}=\{1,3,5,7\}, B=\{x \mid 2 \leqslant x \leqslant 5\}$, 则 $A \cap B=\{3,5\}$. 故选：B.
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