Collecting raw material, which is reading books and taking notes, is very much like the process of brainstorming at the prewriting stage of an ordinary essay.
收集原始资料，即阅读书籍和做笔记，很像写一篇普通文章前的头脑风暴过程。
Which prewriting activities are more effective than the others?
哪些写前活动在哪些方面更有效?。
Even your decision toswitchtopics while prewriting is a type of revising.
