在托福听力考试中，往往由于录音语速很快，很多同学就不能及时抓取关键信息。下面，小编就托福听力考试中关于推断题如何做答，给大家提供解题技巧，具体如下：
只知道这个做题技巧，有些时候还不够，要真正破解推断题，我们还需知道这类题型常见的推断方式，主要有三种：
1.具体——概括
2.正反推断
3.取反法
接下来我们结合TPO的题目来具体分析每种推断方式。
文章里说的是比较具体的内容，答案却换成了概括性说法。
比如TPO 27 Lecture 4Listen to part of a lecture in a studio art class.
·Professor: OK. As you probably know,primary colors are,theoretically speaking,the basic colors from which all other colors can be made.But as you’ll find out when you start working on your painting projects,the three primary colors – red,blue,yellow – don’t always make the best secondary colors. Combining red and blue,you will probably never get a fantastic violet. To get a nice violet,you’ll have to add white. Combining yellow and blue,you will almost never get a satisfactory green.You are better off using a pure green pigment.
30. What does the professor imply about of the usefulness of the theory of primary colors?
A. It is not very useful to artists.
B. It has been very useful to scientists.
C. It is more useful to artists than to psychologists.
D. It is more useful to modern day artists than to artists in the past.
解析：
很多学生都觉得自己没有听到useful这个单词，第一个把它排除，去选有刚听到单词的选项B、C或D。但是这道题是推断题，刚刚我们讲到推断题的正确选项往往没有文章直接提到的词汇或表达，所以A反而最有可能是正确选项。
从推断方式来说，这道题是具体→概括这种推法的一个典型例子。
文章中提到三原色并不总能混出很好的二类色，并举了三个例子。但是题目问的是三原色理论的有用性，其实就是概括地表达而已，混色不完美→不是很有用，所以正确选项A。
具体到概括是推断题最常见的推断方式，比如TPO 27 Lecture 1 root system traps sediments 吸收杂质-increase the quality of water 水质量提升，TPO 29 Lecture 3里的couldn’t expect to throw the spear over any distance accurately 矛不能想扔哪就扔哪-tool is not functional。大家认真通过这几个例子熟悉这种推断方式。
文章里一直说的是正面或反面的情况，题目会问相反的情况是什么样的。
比如TPO 16 Lecture 1Listen to a part of lecturer in a geology class.
And Lechuguilla is pretty much dormant now. It’s not really forming any more. But,there is other ones like it,for example,in Mexico,that are forming.And when cave researchers go to explore them,they see and smell,the sulfuric acid and gases of...er...phew...now,something else,think of rotten eggs. And,it’s not just the smell. Explorers even need to wear special masks to protect themselves from the gases in these caves. OK? Paul.
10. What can be inferred from the fact that Lechuguilla Cave is no longer forming?
A. The cave has stopped attracting visitors.
B. The cave no longer contains any limestone.
C. The air in the cave is safer to breathe now than it was in the past.
D. Gypsum deposits inside the cave are growing thicker.
解析：
文章说到Lechuguilla不再形成，而Mexico的洞穴还在形成，并释放难闻有毒的气体。题目中问的是从Lechugilla不再形成这个事实可以推出什么?这就属于正反推断的情况，从形成的洞穴会释放有毒气体→不在形成的洞穴不会释放有毒气体，比以前更安全，所以答案选C。文章也未直接出现safe这个词。
取反法是对比信息取反的方法。对比的两个对象可以是不同的事物，也可能是同一事物的不同时期。如果A和B进行对比，A的反面就是B。
通常来说，各个参数完全相反。这个原理，可以运用到托福推断题中。
比如TPO 16 Lecture 1 Listen to a part of lecturer in a geology class.
And Lechuguilla is pretty much dormant now. It’s not really forming any more. But,there is other ones like it,for example,in Mexico,that are forming. And when cave researchers go to explore them,they see and smell,the sulfuric acid and gases of...er...phew...now,something else,think of rotten eggs. And,it’s not just the smell. Explorers even need to wear special masks to protect themselves from the gases in these caves. OK? Paul.
10. What can be inferred from the fact that Lechuguilla Cave is no longer forming?
A. The cave has stopped attracting visitors.
B. The cave no longer contains any limestone.
C. The air in the cave is safer to breathe now than it was in the past.
D. Gypsum deposits inside the cave are growing thicker.
解析：文章说到Lechuguilla不再形成，而Mexico的洞穴还在形成，并释放难闻有毒的气体。题目中问的是从Lechugilla不再形成这个事实可以推出什么?这就可以利用取反法推断出正确答案。从形成的洞穴会释放有毒气体→不在形成的洞穴不会释放有毒气体，比以前更安全，所以答案选C。文章也未直接出现safe这个词。
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