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
Although specific concerns may determine the intent of a research project, its results are often ______.
A．unanticipated
B．beneficial
C．expensive
D．spectacular
单项选择题
Although economists have traditionally considered the district to be solely an agricultural one, the ______ of the inhabitants' occupations makes such a classification obsolete.
A．productivity
B．diversity
C．predictability
D．stability
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