【待插入句子】One of the major effects was the rapid growth of the human population itself.

　　【待插入段落】Paragraph 1: The universal global warming at the end of the Ice Age had dramatic effects on temperate regions of Asia, Europe, and North America. Ice sheets retreated and sea levels rose. The climatic changes in southwestern Asia were more subtle, in that they involved shifts in mountain snow lines, rainfall patterns, and vegetation cover. However, these same cycles of change had momentous impacts on the sparse human populations of the region. At the end of the Ice Age, no more than a few thousand foragers lived along the eastern Mediterranean coast, in the Jordan and Euphrates valleys. Within 2,000 years, the human population of the region numbered in the tens of thousands, all as a result of village life and farming. Thanks to new environmental and archaeological discoveries, we now know something about this remarkable change in local life.

　　正確答案為3rd square;

　　2.插入句子說 重大影響中的一個是：快速增長的人口。那么一定要跟在major effects后面，而我們看到了段落中的momentous impacts;完美的paraphrase，所以毫無疑問就是這里了。

　　再看段落，組成也很明確：1st為TS主旨句——全球變暖對于各洲的溫帶(temperate)區(qū)域有dramatic effcts。2nd: 西南亞的氣候變化更細微。 3rd: 但是，同樣的變化循環(huán)對人口稀少(sparse)的區(qū)域有巨大的影響。4th:在冰河世界末期，只有數(shù)千人。2000年間，人口成千上萬的增長，都是因為鄉(xiāng)村生活和農耕。5th：多虧了新發(fā)現(xiàn)，我們知道這種當?shù)厣�活的劇烈變化�?/P>