在托福聽力考試中，往往由于錄音語速很快，很多同學(xué)就不能及時(shí)抓取關(guān)鍵信息。下面，小編就托福聽力考試中關(guān)于推斷題如何做答，給大家提供解題技巧，具體如下：

推斷題的做題技巧

只知道這個(gè)做題技巧，有些時(shí)候還不夠，要真正破解推斷題，我們還需知道這類題型常見的推斷方式，主要有三種：

1.具體——概括

2.正反推斷

3.取反法

接下來我們結(jié)合TPO的題目來具體分析每種推斷方式。

1、具體——概括

文章里說的是比較具體的內(nèi)容，答案卻換成了概括性說法。

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：

很多學(xué)生都覺得自己沒有聽到useful這個(gè)單詞，第一個(gè)把它排除，去選有剛聽到單詞的選項(xiàng)B、C或D。但是這道題是推斷題，剛剛我們講到推斷題的正確選項(xiàng)往往沒有文章直接提到的詞匯或表達(dá)，所以A反而最有可能是正確選項(xiàng)。

從推斷方式來說，這道題是具體→概括這種推法的一個(gè)典型例子。

文章中提到三原色并不總能混出很好的二類色，并舉了三個(gè)例子。但是題目問的是三原色理論的有用性，其實(shí)就是概括地表達(dá)而已，混色不完美→不是很有用，所以正確選項(xiàng)A。

具體到概括是推斷題最常見的推斷方式，比如TPO 27 Lecture 1 root system traps sediments 吸收雜質(zhì)-increase the quality of water 水質(zhì)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。大家認(rèn)真通過這幾個(gè)例子熟悉這種推斷方式。

2、正反推斷

文章里一直說的是正面或反面的情況，題目會(huì)問相反的情況是什么樣的。

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：

文章說到Lechuguilla不再形成，而Mexico的洞穴還在形成，并釋放難聞?dòng)卸镜臍怏w。題目中問的是從Lechugilla不再形成這個(gè)事實(shí)可以推出什么?這就屬于正反推斷的情況，從形成的洞穴會(huì)釋放有毒氣體→不在形成的洞穴不會(huì)釋放有毒氣體，比以前更安全，所以答案選C。文章也未直接出現(xiàn)safe這個(gè)詞。

3、取反法

取反法是對(duì)比信息取反的方法。對(duì)比的兩個(gè)對(duì)象可以是不同的事物，也可能是同一事物的不同時(shí)期。如果A和B進(jìn)行對(duì)比，A的反面就是B。

通常來說，各個(gè)參數(shù)完全相反。這個(gè)原理，可以運(yùn)用到托福推斷題中。

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：文章說到Lechuguilla不再形成，而Mexico的洞穴還在形成，并釋放難聞?dòng)卸镜臍怏w。題目中問的是從Lechugilla不再形成這個(gè)事實(shí)可以推出什么?這就可以利用取反法推斷出正確答案。從形成的洞穴會(huì)釋放有毒氣體→不在形成的洞穴不會(huì)釋放有毒氣體，比以前更安全，所以答案選C。文章也未直接出現(xiàn)safe這個(gè)詞。

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