单选题：城市群的竞争力很大程度上取决于群内城市问的产业分工与合作。图3示意城市群内部城市间的产业链分工体系。完成5—6题。城市

题目内容：

城市群的竞争力很大程度上取决于群内城市问的产业分工与合作。图3示意城市群内部城市间的产业链分工体系。完成5—6题。

城市群中，中心城市的优势产业处于产业链中的位置是
A．①⑤
B．②④
C．③④
D．①③

参考答案：

答案解析：

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