The sequence in which they migrate correlates with their body size.

　　插入的句子表达了一个观点：它们迁移的顺序是与身体大小相关的。那么我们只要找一个例子和身体大小相关的句子即可。最后一句话the larger, less fastidious feeders, the zebras, move in first. 通过这两组词我们就可以判断出来这是一个例子，所以答案选最后一个黑框。

　　Chinese porcelain wares imported into the Arab world. ■So admired were these pieces that they encouraged the development of earthenware made in imitation of porcelain and instigated research into the method of their manufACTure. ■From the Middle East the Chinese acquired a blue pigment—a purified form of cobalt oxide unobtainable at that time in China—that contained only a low level of manganese. Cobalt ores found in China have a high manganese content, which produces a more muted blue-gray color. ■In the seventeenth century, the trading ACTivities of the Dutch East India Company resulted in vast quantities of decorated Chinese porcelain being brought to Europe, which stimulated and influenced the work of a wide variety of wares, notably Delft. ■The Chinese themselves adapted many specific vessel forms from the West, such as bottles with long.

　　Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　Foreign trade was also responsible for certain innovations in coloring.

　　这句话也是观点：外贸也是颜色创新的原因。那么例子只要涉及到颜色，外贸即可。第二句话谈到：Middle East and blue, 所以答案是第二个黑色方框。

　　三、总结

　　句子与句子之间的连接，主要是通过以上五种方法进行的，所以我们在做题时，先分析所给的插入句子，找出句子里面的名词，代词，连接词，其次要理解这些关键词的意思，如果不理解其意思，即使找出来，有时候也帮助不大，所以同学们不仅需要技巧还需要扎实的基本功，比如词汇理解，句子结构分析的能力。