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  3. There is nothing in this world constant but inconstancy一SWIFT Project after project designs a set of algorithms and then plung

There is nothing in this world constant but inconstancy一SWIFT Project after project designs a set of algorithms and then plung

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问题                            There is nothing in this world constant but inconstancy一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 (71) usable．It may be t00 slow,too big，  awkward to use，or all three．There is no (72) but to start again，smarting but smarter,and  build a redesigned version in which these problems are solved．The discard and (73) may  be done in one lump，or it may be done piece—by—piece．But all large．system expenence 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  fight 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  (74)．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(75)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．   
(75)
选项 A、worth
B、value
C、cost
D、invaluable
答案C
解析
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