单项选择题

The notion that a parasite can alter the behavior of a host organism is not mere fiction; indeed, the phenomenon is not even ______.

A. observable
B. real
C. comprehended
D. rare
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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. profitability
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. spectacular
D. specialized
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