单项选择题

Why may partial theories be completely wrong

A．It doesn't work to investigate a problem.
B．Everything is so intertwined that it's hard to break a problem up into bits.
C．The sum of the partial theories may disagree with the full solution to a problem.
D．They have not been proved as scientifi

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单项选择题

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.

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