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
For some time now, ______ has been presumed not to exist: the cynical conviction that everybody has an angle is considered wisdom.
A．rationality
B．flexibility
C．disinterestedness
D．insincerity
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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