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    【题目】已知集合A，B，若A不是B的子集，则下列命题中正确的是

    A．对任意的a∈A，都有aB

    B．对任意的b∈B，都有bA

    C．存在a0，满足a0∈A，a0B

    D．存在a0，满足a0∈A，a0∈B

    【答案】C

    【解析】A不是B的子集，也就是说A中存在某个元素不属于B，显然正是C选项要表达的．对于A和B选项，取A＝{1,2}，B＝{2,3}可否定，对于D选项，取A＝{1}，B＝{2,3}可否定．

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