题目内容：
中国2010年上海世界博览会于4月30目20时(北京时间)隆重开幕，本届世博会将历时184天。设P点为晨昏圈与纬线的切点，当世博会开幕时，P点所在地盛行东南风。完成11—12题。 
参考答案：
答案解析：
单选题：中国2010年上海世界博览会于4月30目20时(北京时间)隆重开幕，本届世博会将历时184天。设P点为晨昏圈与纬线的切点
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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
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