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 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