Gaokao Math Practice Question
设集合 $A=\{1,2,3\}, B=\{4,5\}, M=\{x \mid x=a+b, a \in A, b \in B\}$, 则 $M$ 中元素的个数为 （$\qquad$）
- A.3
- B.4
- C.5
- D.6
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