托福听力考试中个题目便是反复考核大家对于文章主旨的认知，因此我们才把此类题目称为主旨题，下面我们就重点来看看。
国外院校老师在她每次上课前，都会反复的强调：
Today's lecture is about
Today's lecture is the lecture about
What I like to do is to
What I want to talk about in today's lecture is
The topic of today's lecture as you can see from the title is
其实这些内容也是我们中文老师上课前时常会跟大家强调的，大家是否觉得此类句子后面跟的便是今天课上的内容呢？是的，这就是我们要给大家讲授的主旨题。只要你明白了主旨题，你就会清晰老师考核了什么，这篇听力的内容是什么，其他部分都遵循主旨，做题速度就会很快。
题目问法：
What is the lecture mainly about？
What is the main idea of the lecture？
What does the professor mainly discuss？
信号词：
Today we will talk about/ discuss
Today we will look at / tell..
Now I want to talk about is...
The topic today is …
I want to begin today by
听力笔记重点：
关注信号词之后的内容，留意同意转换
我把主旨题的方法论梳理为三字口诀：定，判，转
内容主旨三步走
1.定(出题位置)在开头
2.判(信号词)出现开始认真听
3.转(同义表达)记笔记
下面我们先来查看道主旨题
12. What is the lecture mainly about? (TPO17 L4)
A. Different kinds of color vision in sea animals.
B. Differences in appearance between various species of octopus.
C. Ways that octopuses attract their prey.
D. Ways that octopuses protect themselves from predators.
听力文本：
Ok，now I want to talk about an animal that has a fascinating set of defense mechanisms.And that’s the octopus, one of the unusual creatures that live in the sea.The octopus is prey to many species, including humans, so how does it escape its predators？
定：Listen to the part of lecture in a biology class
听到这句话便明白是在文章的最开头
判：now I want to talk about
转：an animal that has a fascinating set of defense mechanisms
遵循之前给大家讲述的三段论进行分类之后，可以很明显的把信号词后面的主旨找出来，同义转化一下defense和protect就好了。
那下面我们再来看一道练习题
6.What aspect creative writing does the professor mainly discussz？（TPO6 L3）
A.How to keep a reader’s interest
B.How to create characters
C.Key differences between major and minor characters
D.Techniques for developing short-story plots
听力文本：
Alright everybody, the topic for today is, well, we’re gonna take a look at how to start creating the characters for the stories you’re writing.One way of doing that is to come up with what’s called “a character sketch”, I don’t mean a sketch like a drawing, I guess that’s obvious.It’s um…it’s a…a sketch is a way of getting started on defining your characters’ personalities.To begin, how do we create fictional characters?
定：Listen to the part of lecture in a creative class
这是一堂写作课
判：The topic for today is，We’re goanna to take a look at
转：How to start creating the characters
