The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of human need; (1) is truly the mother of invention. People usually devise tools to (2) for natural deficiencies. For example, people invented weapons to defend (3) from physically superior (4) . But (5) is only one incentive for inventions. People also invent (6) tools to (7) certain established tasks more efficiently. For instance, people developed the bow and arrow from the (8) spear or javelin in order to shoot (9) and strike with greater strength.
(10) civilizations developed, greater work efficiency came to be demanded, and (11) tools became more (12) . A tool would (13) a function until it proved (14) in meeting human needs, at which point an improvement would be made. One impetus for invention has always been the (15)
A. their possessions
B. their children
C. themselves
D. them
“越是困难的时候越需要自信，越是形势向好的时候越需要清醒。”体现的哲理是（）
①人能能动地认识世界和改造世界
②事物的量变都会引起质变
③矛盾双方在一定条件下相互转化
④发展是前进性与曲折性的统一
材料一、政府执法工作做得如何，群众心里最清楚。某市对城市市容和环境卫生管理规定的执行情况通过听证会的形式让市民和政府展开面对面的对话。一个市民说：“这种面对面的监督，才是实实在在的民主，实实在在的监督。”
材料二、某市开展“万人评议机关”活动，市政府的几十个部门和直属单位成为其中评议的对象。春节后上班的第一天，市政府展开全体干部会议，对群众意见较大、满意率排在最后的五个部门的主要领导分别作出免职、降职等处理决定。市政府领导明确表示：凡是人民群众满意率低的干部，一律不能过关。
请运用政治生活知识回答下列问题：
The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product.
During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and the defines （） showing how the system will be operated, publishes the system and operation concept documents, and conducts a system concept review (SCR).
Following the SCR, the team derives （） requirements for the system from the highlevel requirements and the system operations concep
A. producer
B. customer
C. programmer
D. analyser
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