单项选择题

According to the last paragraph, the author may suggest that______.

A．either of the two partial theories may be correct
B．the new theory has been established to replace the two partial theories
C．the new theory may develop from either of the two partial theories
D．the new theory may combine many of the properties of the two partial theories
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单项选择题
Which of the following signified that a new theory was established
A．The general theory of relativity makes more accurate prediction of the motion of Mercury than the theory of gravity.
B．It is much simpler to work with the theory of gravity than with the general theory of relativity.
C．The general theory of relativity evolved from the theory of gravity.
D．The general theory of relativity is used for scientific research while the theory of gravity is used for all practical purposes.
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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