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【单选题】
没有脊索动物是导管动物，所有的翼龙都是导管动物，所以，没有翼龙属于类人猿家族。以下哪项陈述是上述推理所必须假设的（ ）A.
所有类人猿都是导管动物
B.
所有类人猿都是脊索动物
C.
没有类人猿是脊索动物
D.
没有脊索动物是翼龙
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