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请把unit 5 iexplore 1 相应的单词和短语写在（）里，1-15是单词，16-20是短语：

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简述工作结构分解的过程和方法。

SDLC that assumes phases can be completed sequentially with no overlap or iteration. Once one phase is completed, you fall over the waterfall to the next phase, no going back. This text describes which kind of development model.

A. Iterative model
B. Agile model
C. Waterfall model
D. Incremental model

Interviews, questionnaires, documents, observing business processes, researching vendors, comments and suggestions belong to which part of system analysis activity.

A. Define Requirements
B. Gather Detailed Information
C. Prioritize Requirements
Develop User-Interface Dialogs

In the following descriptions, which one is NOT about user story.

As a
B. I want to
C. so that
D. draw