单项选择题

Consider the universal cannibalism of the sea, all of whose creatures ______ one another.

A．hide from
B．ferret out
C．prey on
D．compete against
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单项选择题
The medieval church condemned man's partaking in ______ pleasures.
A．educational
B．ascetic
C．asexual
D．sensual
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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