题目
已知一段演绎推理：“因为指数函数y=ax是增函数，而y=是指数函数，所以y=是增函数”，则这段推理的（ ）
A . 大前提错误
B . 小前提错误
C . 结论正确
D . 推理形式错误
答案：A
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