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
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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
单项选择题
It comes as no surprise that societies have codes of behavior. The character of the codes, on the other hand ,can often be ______.
A．predictable
B．unexpected
C．explicit
D．confusing
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