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已知集合 $A=\{0,1,2,3,4,5,6\}, B=\{2,4,6,8\}$ ,则 $A \cap B=(\quad)$
A. $\{2,4,6,8\}$     B. $\{2,4,6\}$     C. $\{0,1,2,3,4,5,6,8\}$     D. $\{2,4\}$         
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