A scientist often reaches a dead end tha

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问题 A scientist often reaches a dead end that leads to no alternatives in research and has to go back and determine if all the____made are true to how the world operates.A.equationsB.principlesC.assumptionsD.theories

选项 A.equations
B.principles
C.assumptions
D.theories

答案 C

解析 本题考察近义词辨析,四个选项都是抽象名词的复数形式。A选项equations,意为“方程式”;B选项principles,意为“原则,法则”;C选项assumptions,意为“假设,设想”;D选项theories,意为“理论”。题目意为“在研究世界运行机制的过程中,科学家常常会走入死胡同,此时他们别无选择,只能回头去检验研究中的全部设想正确与否。”
  
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