Write an outline: Read the following passage carefully and compose a “topic outline” for it.
The Human Brain
For centuries, people wondered about how the human brain works. Researchers were particularly concerned about its structure and functions. It was not long ago that scientists made the remarkable discovery that our brains are divided into two halves—left brain and right brain, and that each half has separate features and roles.
The left brain is said to be the logical brain. It is the left brain that we use to solve mathematical problems and go think logically. For example, if you are asked how to make coffee, this is what happens. Your left brain begins to work; it searches its files for information on coffee making. If it finds the files, it begins relating what to do step by step. If it does not find any record, it says it does not know.
The right brain is often called the creative brain. It has the function of thinking creatively. This contains all the artistic functions, including art and music appreciation. When you want to draw a picture or compose a piece of music or write poetry, it is the right brain that is in operation. When you come across a new situation in your life, your right brain gives ideas on how to tackle it.
To some people, the left brain is dominant and to others, the right brain is. Of people who are good in mathematics and language expression—that is, putting into practice what they have learnt, we say that they are more left-brained. They are not very sensitive and believe in doing everything only after reasoning. They are very sharp at arguments. They are the type who will not believe in anything until they see it. Right-brained people are more artistic and have a good sense of music appreciation. They are also more sensitive and tend to be emotional. They are more open to new ideas and are willing to accept radical positions.
Is the left brain better or the right brain? Both sides of the brain are equally important. In an ideal situation, a person should be exactly equal in both sides of the brain. However, as in most things, the ideal never happens. People are dominated by one or the other side of their brains. In order to function effectively in the world, we must learn to use both sides of the brain. In many situations that we meet in the world, there will be requirements for both sides of the brain to work together as partners. For example, when you want to write a story, which brain do you use? The answer is both brains. You need the right brain to think of the ideas and you need the left side to arrange everything in a logical sequence. You cannot go through life with only one side functioning. It’s fundamentally important for people to know these interesting facts about the human brains. However, many aspects concerning our brains still remain unknown. With scientists’ persistent efforts, more secrets of the human brain will be revealed.
【正确答案】：
Ⅰ INTRODUCTION: SCIENTISTS' DISCOVERY ABOUT HUMAN BRAIN
    A. PEOPLE'S CONCERN ABOUT THE STRUCTURE AND FUNCTIONS OF THE BRAIN
    B. THESIS: OUR BRAINS ARE DIVIDED INTO TWO HALVES AND EACH HALF HAS SEPARATE FEATURES AND ROLES
Ⅱ FEATURES AND ROLES OF LEFT AND RIGHT BRAINS
    A. LEFT BRAIN WITH THE FUNCTION OF THINKING LOGICALLY
    B. RIGHT BRAIN WITH THE FUNCTION OF THINKING CREATIVE
Ⅲ DOMINANCE OF LEFT OR RIGHT BRAIN
    A. FEATURES OF LEFT-BRAINED PEOPLE
    B. FEATURES OF RIGHT-BRAINED PEOPLE
    C. COORDINATION OF LEFT AND RIGHT BRAINS
Ⅳ CONCLUSION: MORE TO BE LEARNED ABOUT HUMAN BRAIN
【题目解析】：本篇文章为一篇说明文，介绍了科学家们对于人脑的发现。第一段最后一句话为本文的主旨句：我们的大脑分为两半——左脑和右脑，每一半都有不同的特征和角色。Ⅰ Introduction: scientists' discovery about human brain A. People's concern about the structure and functions of the brain B. Thesis: Our brains are divided into two halves and each half has separate features and roles文章第二三段分别介绍了左右脑的特征和角色。Ⅱ Features and roles of left and right brains A. Left brain with the function of thinking logically B. Right brain with the function of thinking creative第四段分别介绍了左脑占主导地位的人和右脑占主导地位的人的特征，第五段说明了左右脑的合作运作。Ⅲ Dominance of left or right brain A. Features of left-brained people B. Features of right-brained people C. Coordination of left and right brains最后一段为全文的总结，仍有更多的秘密等待科学家们去探索发现。Ⅳ Conclusion: more to be learned about human brain