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Pure or Theoretical Knowledge For me, scientific knowledge is divided into mathematical sciences, natural sciences or scie

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问题                  Pure or Theoretical Knowledge
      For me, scientific knowledge is divided into mathematical sciences, natural sciences or sciences dealing with the natural world (physical and biological sciences), and sciences dealing with mankind (psychology, sociology, all the sciences of cultural achievements, every kind of historical knowledge). Apart from these sciences is philosophy, about which we will talk later. In the first place, all this is pure of theoretical knowledge, sought only for the purpose of understanding, in order to fulfil the need to understand that is intrinsic and consubstantial to man. What distinguishes man from animal is that he knows and needs to know. If man did not know that the world existed, and that the world was of a certain kind, that he was in the world and that he himself was of a certain kind, he wouldn’t be man. The technical aspects or applications of knowledge are equally necessary for man and are of the greatest importance because they also contribute to defining him as man and permit him to pursue a life increasingly more truly human.
      But even while enjoying the results of technical progress, he must defend the primacy and autonomy of pure knowledge.  Knowledge sought directly for its practical applications will have immediate and foreseeable success, but not the kind of important result whose revolutionary scope is in large part unforeseen, except by the imagination of the Utopians. Let me recall a well-known example. If the Greek mathematicians had not applied themselves to the investigation of conic sections, zealously and without the least suspicion that it might someday be useful, it would not have been possible centuries later to navigate far from shore. The first man to study nature of electricity could not imagine that their experiments, carried on because of mere intellectual curiosity, would eventually lead to modern electrical technology, without which we can scarcely conceive of contemporary life, Pure knowledge is valuable for its own sake, because the human spirit cannot resign itself to ignorance. But, in addition, it is the foundation for practical results that would not have been reached if this knowledge had not been sought disinterestedly.  
The practical scientist______.
选项 A、is a philosopher
B、is interested in the unknown
C、knows the value of what he will discover
D、knows that the world exists
答案C
解析 第二段第二句开头提到“以实际应用为直接目的而获得的知识，会立即产生可预见的效果”，而“the practical scientist”的研究自然也是以此为目的的，因此他可以预见到其发展的应用价值。所以正确答案应当为C。
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