托福真题解题思路范例详解

　　以下是托福真题中的句子插入题，我们来具体的运用适合的解题思路解答这类题型。

　　Earth’s Atmosphere

　　Along with the buildup of molecular oxygen (O2) came an eventual increase in ozone (O3) levels in the atmosphere. [■] Because ozone filters out harmful ultraviolet radiation, this made it possible for life to flourish in shallow water and finally on land. [■] This critical state in the evolution of the atmosphere was reached between 1100 and 542 million years ago. [■] Interestingly, the fossil record shows an explosion of life forms 542 million years ago. [■]

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

　　The timing strongly suggests that atmospheric changes were responsible for this sudden increase in new life.

　　Where would the sentence best fit?

　　解题思路

　　首先The timing strongly suggests that atmospheric changes were responsible for this sudden increase in new life. 其中出现线索 “the timing”、“this sudden increase in new life”等指代前文内容，属于句子插入题的“指代逻辑”类型。

　　精读给出句，根据句意“这个时间强烈暗示了新生命的激增是因为大气变化”，我们可以预判前文要出现时间、新生命的急剧增长以及大气变化等内容。

　　接着我们回到原文进行定位并核对四个方块位置。选项A前面出现 “the buildup of molecular oxygen”、“an eventual increase in ozone (O3) levels”，属于“atmospheric changes”的同义替换。选项A前没有出现关于时间及新生命的急剧增长等指代内容，不符合预判，排除选项A。选项B前同样没有出现关于时间的指代内容，排除B。注意选项B前的“ this made it possible for life to flourish” 中，动词flourish 表示to grow or develop successfully，并不等同于急剧增长。选项C前出现时间“between 1100 and 542 million years ago ”，但却没有出现关于新生命的急剧增长，继续排除C。选项D前出现时间“542 million years ago”、新生命的急剧增长“an explosion of life forms” ，再加上前文出现的大气变化，符合我们对给出句前文的所有预判。

　　最后将给出句代入进行检验，前后衔接符合逻辑，正确答案选D。

　　除了指代逻辑，句子插入题还考察其他很多逻辑关系，包括转折、因果等，下面给出另外一道真题，同学们可以按照以上讲解的思维方法，尝试进行答题，并思考该题所考察的逻辑关系。

　　Early monies were simple snippets of action—acrobats tumbling, horse running, jugglers juggling, and so on. Eventually, the novelty wore off and films became less of an attraction. Public interest was soon rekindled when early filmmakers discovered that movies could be used to tell story. [■] In France, Alice Guy-Blachè produced The Cabbage Fairy, a one-minute film about a fairy who produces children in a Cabbage patch, and exhibited it at the Paris International Exhibition in 1896. [■] Guy-Blachè went on to found her own studio in America. [■] Better known is the work of a fellow French filmmaker and magician, Georges Méliès. [■] In 1902 Méliès produced a science-fiction film that was the great-great-grandfather of Star Wars and Star Trek; it was called A Trip to the Moon.

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

　　Although she directed hundreds of short films and produced hundreds more over the course of her career, she has largely been forgotten.

　　Where would the sentence best fit?