托福阅读句子插入题怎么做备考方法有哪些

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核心分析

托福阅读句子插入题解题核心分析

句子插入题解题核心就在于要把待插入句子放在方框内，使得它能和上下文衔接得当。如何做到上下文衔接得当?其一：句意。其二：逻辑。

如果待插入句子中出现代词加名词短语，我们一定在原文中找到这个代词的指代;如果文中只有一处合适，答案就是那句话的后面;如果有两处以上符合，那么我们就观察一下这句话中有没有逻辑关系词，我们一定要确定这句话和上文逻辑关系正确。

实例解读

托福插入题实例解读

01转折关系

一旦给定句中出现转折关系,就意味着该句的前后文内容存在反义。如下例:

Leatherbacks keep their body heat in three different ways.The first, and simplest, is size. The bigger the animal is, the lowerits surface-to-volume ratio; for every ounce of body mass, thereis proportionately less surface through which heat can escape. Anadult leatherback is twice the size of the biggest cheloniid seaturtles and will therefore take longer to cool off. Maintaining a highbody temperature through sheer bulk is called gigantothermy.It works for elephants, for whales, and,perhaps, it worked for many of the larger dinosaurs.It apparently works, in a smaller way, for some other sea turtles.Large loggerhead and green turtles can maintain their bodytemperature at a degree or two above that of the surroundingwater, and gigantothermy is probably the way they do it.Muscular activity helps, too, and an actively swimming greenturtle may be 7℃ (12.6 F) warmer than the waters it swimsthrough.

However, these animals have additional means of staying warm.

从给定句的语义不难看出,该句后文必然要提到某种保暖的方法。而从however引导的转折逻辑和additional可以想到，这是一种额外的方法,也就意味着在该句前文已经提到过另一种保暖方法。通读原文，可以发现只有空格4符合要求(前有gigantothermy，后有muscular activity )

02因果关系

一旦给定句中出现因果关系,就意味着该句是原文中某句的原因(一般在原文句前 )或结果( 一般在原文句后)。如下例

Another task for the Glomar Challenger S scientists was totry to determine the origin of the domelike masses buried deep beneath the Mediterranean seafloor.These structures had beendetected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling.Were theysalt domes such as are common along the United States Gulf Coast, and if so, why should there have been so much solid crystalline salt beneath the floor of the Mediterranean?

Thus, scientists had information about the shape of thedomes but not about their chemical composition and origin.

从给定句的语义不难看出,该句描述的是某种科学研究方法,能让科学家了解到dome的形状，但无法获知其化学成分和起源,而这种方法的出现应该在该句前面。通读全文，不难发现空格3前提及曾使用echo-sounding instruments (回声探测设备) ,但没有经过drilling (钻探) , 完全符合要求.

03递进关系

Transportation was becoming less of a problem for those who wished to move west and for those who had farm surpluses to send to market. Prior to 1815, western farmers who did notlive on navigable waterways were connected to them only by dirtroads and mountain trails. Livestock could be driven across themountains, but the cost of transporting bulky grains in thisfashion was several times greater than their value in easternmarkets. The first step toward an improvement of western transportation was the construction of turnpikes. These roads made possible a reduction in transportation costs and thusstimulated the commercialization of agriculture along their routes.

In fact, goods could be shipped more cheaply across themuch greater distance of the Atlantic Ocean than they couldfrom western New York to coastal cities.

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