3. 三册（Developing Skills）：掌握英语的关键。
经典示例：
Lesson 26 Wanted: A Large Biscuit Tin
No one can avoid being influenced by advertisements. Much as we may pride ourselves on our good taste, we are no longer free to choose the things we want, for advertising exerts a subtle influence on us. In their efforts to persuade us to buy this or that product, advertisers have made a close study of human nature and have classified all our little weaknesses.
Lesson 60 Too Early And Too Late
Punctuality is a necessary habit in all public affairs in civilized society. Without it, nothing could ever be brought to a conclusion; everything would be in a state of chaos. Only in a sparsely populated rural community is it possible to disregard it. In ordinary living, there can be some tolerance of unpunctuality.
4. 四册（Fluency in English）：体味英语的精髓。
经典示例：
A man without an education, many of us believe, is an unfortunate victim of adverse circumstances deprived of one of the greatest twentieth-twentieth-century opportunities.
(Lesson 41)
It is no use doing what you like; you have got to like what you do. Broadly speaking, human beings may be divided into three classes: those who are toiled to death, those who are worried to death, and those who are bored to death. (Lesson 58)
(理解自测)
The only arguable plea for capital punishment is the right of society to retribution in this world with the prospect of life in another, but since what used to seem to the great majority of civilized humanity the assurance of another life beyond the grave has come to seem to more and more people less certain, a feeling for the values of human life has become deeper and more widespread.
