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
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.equations
B.principles
C.assumptions
D.theories
B.principles
C.assumptions
D.theories
参考解析
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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