完形填空。 Albert Einstein is said to have been asked by a student, 'what finding helped you most when you were __1__ the theory of relativity?' Einstein replied without __2__ moment's hesitation. 'Finding how to think about the problem.' The same __3__ is told about Sir Isaac Newton and __4__ other scientists. We have no proof __5__ any of these well-known conversations __6__ took place, but we are prepared to believe that they did, and, if so, that the __7__ was the same one Einstein gave, __8__ this is the 'way scientists work and science progresses.' Scientists usually work toward models of the process of structure they are studying. __9__ we have models of the structure of the universe and of the atom, models of the process __10__ which the genetic (遗传的) pattern is passed from one building block of life to _11__ models of the economic system and __12__ on. Some models are mathematical, but a model does not have to have equations (方程) or even diagrams; the __13__ requirement is no doubt that it _14__ an insight (洞察) into the relationships that determine __15__ something works as it does or how it is put together. (     ) 1. A. designing (     ) 2. A. a (     ) 3. A. event (     ) 4. A. any (     ) 5. A. that (     ) 6. A. naturally (     ) 7. A. question (     ) 8. A. although (     ) 9. A. Otherwise (     )10. A. for (     )11. A. either (     )12. A. so (     )13. A. urgent (     )14. A. provide (     )15. A. when B. inventing B. the B. news B. more B. since B. actually B. answer B. because B. Nevertheless B. by B. other B. later B. important B. will provide B. what C. revealing C. an C. story C. few C. which C. eventually C. conversation C. unless C. Still C. on C. both C. further C. original C. provided C. why D. developing D. some D. information D. several D. as D. regularly D. topic D. once D. Thus D. to D. another D. straight D. unnecessary D. is provided D. whether