以下是托福真題中的句子插入題，我們來具體的運(yùn)用適合的解題思路解答這類題型。

　　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?

　　解題思路

　　首先The timing strongly suggests that atmospheric changes were responsible for this sudden increase in new life. 其中出現(xiàn)線索 “the timing”、“this sudden increase in new life”等指代前文內(nèi)容，屬于句子插入題的“指代邏輯”類型。

　　精讀給出句，根據(jù)句意“這個(gè)時(shí)間強(qiáng)烈暗示了新生命的激增是因?yàn)榇髿庾兓?rdquo;，我們可以預(yù)判前文要出現(xiàn)時(shí)間、新生命的急劇增長(zhǎng)以及大氣變化等內(nèi)容。

　　接著我們回到原文進(jìn)行定位并核對(duì)四個(gè)方塊位置。選項(xiàng)A前面出現(xiàn) “the buildup of molecular oxygen”、“an eventual increase in ozone (O3) levels”，屬于“atmospheric changes”的同義替換。選項(xiàng)A前沒有出現(xiàn)關(guān)于時(shí)間及新生命的急劇增長(zhǎng)等指代內(nèi)容，不符合預(yù)判，排除選項(xiàng)A。選項(xiàng)B前同樣沒有出現(xiàn)關(guān)于時(shí)間的指代內(nèi)容，排除B。注意選項(xiàng)B前的“ this made it possible for life to flourish” 中，動(dòng)詞flourish 表示to grow or develop successfully，并不等同于急劇增長(zhǎng)。選項(xiàng)C前出現(xiàn)時(shí)間“between 1100 and 542 million years ago ”，但卻沒有出現(xiàn)關(guān)于新生命的急劇增長(zhǎng)，繼續(xù)排除C。選項(xiàng)D前出現(xiàn)時(shí)間“542 million years ago”、新生命的急劇增長(zhǎng)“an explosion of life forms” ，再加上前文出現(xiàn)的大氣變化，符合我們對(duì)給出句前文的所有預(yù)判。

　　最后將給出句代入進(jìn)行檢驗(yàn)，前后銜接符合邏輯，正確答案選D。

　　除了指代邏輯，句子插入題還考察其他很多邏輯關(guān)系，包括轉(zhuǎn)折、因果等，下面給出另外一道真題，同學(xué)們可以按照以上講解的思維方法，嘗試進(jìn)行答題，并思考該題所考察的邏輯關(guān)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?