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  3. When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world

When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world

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问题     When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world by publishing it, keep the idea secret, or (36)______ it.
    A granted patent is the result of a (37)______ struck between an inventor and the state, by which the inventor gets a limited period of (38)______ and publishes full details of his invention to the public after that period (39)______.
    Only in the most (40)______ circumstances is the life span of a patent extended to alter this normal process of events.
    A patent remains (41)______ public after it has terminated. Indeed, patent experts often advise anyone wishing to avoid the high cost of (42)______ a search through live patents that the one sure way of avoiding violation of any other inventor’s right is to steal and use a dead patent. Likewise, because publication of an idea in any other form permanently (43)______ further patents on that idea, it is traditionally safe to take ideas from other areas of print. (44)____________.
    Anyone closely involved in patents and inventions soon learns that most new ideas are, in fact, as old as the hills. (45)____________ that makes news and money. The basic patent for the theory of magnetic recording dates back to 1886.
(46)____________. Even the Volkswagen rear engine car was anticipated by a 1904 patent for a cart with the horse at the rear.

  
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答案conducting
解析 所填词以a search作宾语，又位于介词of之后，故应用动名词形式。“开展研究”动词应用 conduct，所以填conducting。注意词尾的-ing形式。本句中运用了advise sb. that…句型，wishing to…live patents作anyone的后置定语。
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