单项选择题

An investigation that is ______ can occasionally yield new facts, even notable ones, but typically the appearance of such facts is the result of a search in a definite direction.

A．timely
B．unguided
C．consistent
D．subjective
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单项选择题
To ensure the development and exploitation of a new technology, there must be a constant ______ of several nevertheless distinct activities.
A．interplay
B．implementation
C．improvement
D．exploration
单项选择题
Because folk art is neither completely rejected nor accepted as an art form by art historians, their final evaluations of it necessarily remain ______.
A．arbitrary
B．estimable
C．unspoken
D．equivocal
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