Gaokao Math Practice Question
设全集 $U=\{1,2,3,4,5\}$, 集合 $M$ 满足 $C_{U} M=\{1,3\}$, 则 ($\quad$)
- A.$2 \in M$
- B.$3 \in M$
- C.$4 \notin M$
- D.$5 \notin M$
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