我们以托福独立写作的三选一文章为例，很多同学不知道该类托福写作结构应该如何处理。其实三选一并不复杂，熟记两个注意点就可以轻松应对：一是三者都要提及 ; 二是并没有唯一的正确结构，结构应该根据题目灵活的选择。我们来看一道例题和范文。
Which one is the most important for teacher of high school?
1. The ability to help students plan for their future;
2. The ability to find the students who need help most and help them;
3. Teach students how to learn outside the classroom.
就这道题来讲，题型基本结构的选择有两种：三项能力都重要，但是第一项最重要 ; 或者，第一项是重要的，而第二项和第三项是不重要的。其他的文章结构都是这两种的变体。我们拿第二种结构举例：
总论点：规划未来能力最重要 ( vs. 发现需要帮助的同学 & 教会自学 )
The ability to help student with planning their future is definitely the most important capability for high school teachers.
To begin with, high school students are in desperate need for guidance about their future, and teachers are the only competent candidate to provide it. I know this from my personal experience. When I was in high school, a great portion of my classmates ’ only goal is to reach for the minimum requirement for graduation, and to be able to get an offer from a middle-ranged college in the US, as all 15-year-old boys are profoundly addicted to either computer games or love affairs. Because of our immature mind, we had no idea regarding the choice of universities, or the selection of a future career path. What made matters worse is that our high school teachers provided us with virtually zero guidance concerning our college applications, not because they lack of the intention, but simply because they know nothing about it. Consequently, the vast majority of our parents had to hire an outside agency that specializes in the college application process which costs tons of money. Later we realized that this is an utter mistake, for what they did was simply giving us the timeline of the application process, translating our personal statements and recommendation letters from Chinese into English, and finally mailing out all our materials to the US. All of these simple tasks could be performed by ourselves, and these misfortunes surely could have been avoided if we had the luck to meet more competent teachers, with the ability to warn students and their parents about the black-hearted agencies and lay out lucid plans for students ’ future.
The capability to find the students who need assistance most and help them, on the other hand, is not that imperative. The reason for this is quite simple, since high school students would come to teachers voluntarily if they are in serious trouble. In other words, many times students don ’ t want to be bothered by a teacher who treats them like a baby-sitter. As for the "help" part, I firmly hold the faith that all teachers are already equipped with the willingness to solve student ’ s problem gladly, using their prehistoric powers, no matter how difficult the situation can be. So the willingness to help students should be the minimum standard to be qualified as a teacher.
Similarly, the skill to teach students how to learn outside the classroom is completely unnecessary. For one, most high school students have no time outside their classrooms at all, as all their spare time is already occupied by cram school or by extracurricular activities. Even in the rare circumstance that some students may have free time, parents could always play the part of their instructor on how to self-study.
大家经常会有疑惑的问题就是：我的三个主体段全部都是讲故事，好像手法太单一了，会不会被扣分 ? 如何丰富 ?
答案是：有可能 ; 以及，偶尔的使用纯解释型段落。
众所周知，TOEFL 写作中展开手法有两种，exemplification 和 explanation。例证显然是二者中更简单的一个。因此，大部分同学都更倾向于使用例证。因为它更容易快速上手，并且大家可以通过举例来展开具体化的细节，从而获得高分。但注意，如果三个主体段全部是讲故事展开，未免会有语言太差的嫌疑。因此，除了例证，我们文章中最好可以稍微涉及到一些说理部分。
大家现在可以重新观察一下范文三个主体段的展开手法。三个主体段一共 444 字。其中第一段 259 字，第二段 116 字，第三段 69 字。第一段的展开手法为例证 ( 讲故事 ) ，第二、三段均为解释。
大家明显感受到例证的优势即为能够更轻松的展开出有效并具体化的细节，或俗称 " 好凑字 "。解释的好处为语言简练，表达效率高，文章的递进性、节奏会更紧凑。
例证在 TOEFL 写作中并无太明显的劣势。解释的劣势就比较明显了。同样的一个分论点，有的同学用例证可以很轻松写到 200 字，而解释只能说到 100 字。有的同学可能有个刻板印象：讲故事的语言通常比较简单，句式单一，因此不容易得高分。注意，讲故事语言和句式也是可以复杂的 ; 或者大家可以选择简单但地道的表达，可同样可以获得满分。
因此我们以后考场上的答题战略很简单。第一段为例证段落。目的为使劲凑字，尽量直接写满 200 字。第二、三段可以选择简短的小故事或者解释性段落，分别写到 60～100 字左右。这样主体段已经达到至少 320 字，再加上开头结尾段，可以轻松满足 350 字的字数要求。