2008年9月是全国第五个“中小学弘扬和培育民族精神月”。我校决定开展一次“高擎民族精神火炬，弘扬伟大民族精神”的主题探究活动。青少年作为民族精神的弘扬者、传播者和建设者，请你参与其中。

【知识链接】中 * * 在五千年的发展过程中形成了什么样的伟大民族精神？

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【社会观察】2008年形成的哪些精神是我们伟大民族精神的丰富和发展？

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【献计献策】请你设计几种活动形式让更多的人了解我们的民族精神？

（注：活动形式要紧扣民族精神的内容。如：参观重庆的爱国主义教育基地）

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There is nothing in this world constant but inconstancy. —SWIFT Project after project designs a set of algorithms and then plunges into construction of customer-deliverable software on a schedule that demands delivery of the first thing built. In most projects, the first system built is 1. ______ usable. It may be too slow, too big, awkward to use, or all three. There is no 2.______ but to start again, smarting but smarter, and build a redesigned version in which these problems are solved. The discard and 3.______ may be done in one lump, or it may be done piece-by-piece. But all large-system experience shows that it will be done. Where a new system concept or new technology is used, one has to build a system to throw away, for even the best planning is not so omniscient (全知的) as to get it right the first time. The management question, therefore, is not whether to build a pilot system and throw it away. You will do that. The only question is whether to plan in advance to build a 4.______, or to promise to deliver the throwaway to customers. Seen this way, the answer is much clearer. Delivering that throwaway to customers buys time, but it does SO only at the 5.______ of agony (极大痛苦) for the user, distraction for the builders while they do the redesign, and a bad reputation for the product that the best redesign will find hard to live down. Hence plan to throw one away; you will, anyhow.

2.（）

A．alternative

B．need

C．possibility

D．solution