常见问题：
1.不知道从插入句中提取什么线索;
2.常规解法基本熟练，但不会灵活使用排除法;
3.验证时容易犯“只承上”或“只启下”的错误。
针对上述问题，我结合一道例题给考生一并答疑。
插入句中所提取的线索基本有三种：
a.指代关系(如this/that/the/such等);
b.逻辑关系(如因果/转折等);
c.并列或递进关系(如again/also/another等)。
提取线索的主要目的是预判上下文的内容/情感色彩等，给后面的验证过程提供参考信息。
排除法实际有两种：
a.把插入句带入选项进行一一比对;
b.看选项的前后两句是否本身已有联系，如果有便不能再插入一句把该联系断开。“承上启下”是完美标准，但有些正确选项并不一定吻合既“承上”又“启下”的特点(比如段落最前的A或段落最后的D),所以考生在验证选项时需要“瞻前顾后”，能够衔接上文并同时引导下文的选项才是最佳选项。
例题示范：
While some European countries, such as England and Germany, began to industrialize in the eighteenth century, the Netherlands and the Scandinavian countries of Denmark, Norway, and Sweden developed later. All four of these countries lagged considerably behind in the early nineteenth century. However, they industrialized rapidly in the second half of the century, especially in the last two or three decades. In view of their later start and their lack of coal—undoubtedly the main reason they were not among the early industrializers—it is important to understand the sources of their success.
Look at the four squares that indicate where the following sentence be added to passage.
During this period, Sweden had the highest rate of growth of output per capita of any country in Europe, and Denmark was second.
Where would the sentence best fit?
解题要点：
从插入句中提取指代关系词(this)，预判上文应该提及时间段(period)，D不符合，可排除;
A选项的上下句已有联系(All four of these countries指的就是A选项前的四个国家)，不选;B选项的前后两句已有转折关系(前句讲落后，后句讲迅速工业化)，也不选;
解答句子插入题应该先确保找准插入句中的线索，注意正选和排除的结合，最后验证时要“瞻前顾后”，做到上下句的整体衔接和连贯。
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