A scientist often reaches a dead end that leads to no alternatives in research and has to go back and determine if all the (

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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.

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

答案C

解析 科学家经常达到一个死胡同,导致没有研究的其他选项,于是只能回去确 定是否所有做出的假设对于世界的运行都是真的。A选项,等式;B选项,原理原则;C选项,假设;D选项,理论。因此答案选C项。
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