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　　【待插入句子】But demand for locally unobtainable resources was clearly only a part of the story.

　　【待插入段落】Now that we know much more about ancient exchange and commerce, we know that, because no one aspect of trade was an overriding cause of cultural change or evolution in commercial practices, trade can never be looked on as a unifying factor or as a primary agent of ancient civilization. [■] Many ever-changing variables affected ancient trade, among them the demand for goods. [■] There were also the logistics of transportation, the extent of the trading network, and the social and political environment. [■] Intricate market networks channeled supplies along well-defined routes. [■] Authorities at both ends might regulate the profits fed back to the source, providing the incentive for further transactions. There may or may not have been a market organization. Extensive long-distance trade was a consequence rather than a cause of complex societies.

　　1.答案：2nd square;

　　2.待插入句子：但是需求, 对于当地无法获取的资源的需求，这明显只是一部分原因。

　　3.待插入段落：1st,现在我们已经知道了更多关于古代交换和贸易的事, 贸易不是古代文明形成的主要方式。

　　2nd, 许多一直变化的变量影响到古代贸易，其中就有货物的需求这个变量。

　　3rd, 还有交通的物流问题，贸易网络的范围，以及社会和政治环境。

　　4th, 复杂的市场网络会沿着已有的路径去引导供给。 5th, (路线)两端的当权者都可能去管控利润, 提供了对进一步交易的刺激。6th, 不确定有没有一个市场组织。7th, 扩张的长距离贸易是一个结果，而非一个原因(导致复杂社会的原因)。

　　4.分析：待插入句子是说对于资源的需求只是part of the story, 那么很明确，后面要讲起他因素，前面已经出现过demand for resources了，正好跟2nd square前面的demand for goods以及后面there were also… 联系起来。

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