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 3______ about the problem."
The same 4______ is told about Sir Isaac Newton and 5______ other scientists. We have no proof 6______ any of these well-known conversations 7______ took place, but we are prepared to 8______ that they did, and if so, that the 9______ was the same one Einstein gave, 10______ this is the way scientists work 11______ science progresses.
Scientists usually work toward models of the process or structure they are studying.12______ we have models of the structure 13______ the universe and of the atom, models of the process 14______ which the genetic （遗传的）pattern is passed from one building block of life to 15______， models of the economic system and 16______ on. Some models are mathematical, but a 17______ does not have to have equations（方程式），or even diagrams ； the 18______ requirement is no doubt that it 19______ an insight （洞察力）into the relationships that determine 20______ something works as it does or how it is put together.
17
A、structure
B、pattern
C、process
D、model
【正确答案】：D
【题目解析】：通读本段可知本段一直在讨论各种模型：宇宙结构的模型,遗传过程的模型等。且本空所在这句的前半句也是在说模型的问题，因此可以推测本空也应该是模型，选D。答案为D。
