【单选题】【消耗次数：1】
对一斜率为正且先与价格轴（纵轴）相交，然后与数量轴（横轴）相交的线性供给曲线，其供给价格弹性值（ ）。
①
等于0 ；
②
等于1；
③
大于1；
④
小于1；
参考答案：
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