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。
2
Which prewriting activities are more effective than the others?
哪些写前活动在哪些方面更有效?。
3
Even your decision toswitchtopics while prewriting is a type of revising.