单选题
According to the passage, why can't any physical theory be permanently established?
A、
Such a theory is only suggested as a possible way of explaining an idea.
B、
The person proposing such a theory may be incompetent.
C、
Observations always disagree with predictions.
D、
Observations are always falsified by predictions.
【正确答案】
A
【答案解析】
本文第一段第一句就指出，任何物理理论总是暂时性的，因为它只是一种无法得到证实的假设。而hypothesis的意思就是a possible way of explaining an idea。因此选A。
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